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#include <iostream> // include stream for input/output functionality
using namespace std;
// function main begins program execution
 
int main() // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers // set class main begin with return values as integers
{
 
int num1; // this makes the first integer a readable value
int num2; // this makes the second integer a readable value
int num3; // this makes the third integer a readable value
 
int smallest; //this makes the information for the "smallest" integer a readable value
int largest; //this makes the information for the "largest" integer a readable value
int sum; // this makes the information "sum" a readable value
int average; // this makes the information "average" a readable value
int product; // this makes the information "product" a readable value
 
cout << "Please enter first number\n "; // prompt for user to enter the first integer
cin << num1; // value storage for user entered value of first integer
 
cout << "Please enter second number\n "; // prompt for user to enter the second integer
cin << num2; // value storage for user entered value of second integer
 
cout << "Please enter third number\n "; // prompt for user to enter the third integer
cin << num3; // value storage for user entered value of third integer
 
cout << "Great thanks!" end1;
 
smallest = num1; // assume first integer is smallest and that user enters integers 1 through 3 from smallest to largest
if (num2 < smallest)
smallest = num2; // value placement for num2 as smallest if second integer is smaller than assumed first as smallest
if (num3 < smallest)
smallest = num3; // value placement for num3 as smallest if third integer is smaller than assumed second as smallest
cout << smallest << std::end1; // read value "smallest"
 
largest = num3; // assume third integer is largest and that user enters integers 1 through 3 from smallest to largest
if (num1 > largest)
largest = num1; // value placement for num1 as largest if first integer is larger than assumed third as largest
if (num2 > largest)
largest = num2; // value placement for num2 as largest if second integer is larger than assumed first as largest
cout << largest << std::end1; // read value "largest"
 
sum = num1 + num2 + num3; // sum calculation
cout << "Sum is " << sum << std::endl; // sum value read out
 
average = sum / 3; // average calculation
cout << "Average is " << average << std::endl; // average value read out
 
product = num1 * num2 * num3; // product calculation
cout << "Product is " << product << std::end1; // product value read out
 
} //end main

prog.cpp: In function 'int main()':
prog.cpp:19:5: error: no match for 'operator<<' (operand types are 'std::istream {aka std::basic_istream<char>}' and 'int')
 cin << num1; // value storage for user entered value of first integer
     ^
prog.cpp:19:5: note: candidates are:
In file included from /usr/include/c++/4.9/string:52:0,
                 from /usr/include/c++/4.9/bits/locale_classes.h:40,
                 from /usr/include/c++/4.9/bits/ios_base.h:41,
                 from /usr/include/c++/4.9/ios:42,
                 from /usr/include/c++/4.9/ostream:38,
                 from /usr/include/c++/4.9/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.9/bits/basic_string.h:2772:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<<(basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/4.9/bits/basic_string.h:2772:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:471:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
     ^
/usr/include/c++/4.9/ostream:471:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:476:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
     ^
/usr/include/c++/4.9/ostream:476:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:482:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)
     operator<<(basic_ostream<char, _Traits>& __out, char __c)
     ^
/usr/include/c++/4.9/ostream:482:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:488:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)
     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
     ^
/usr/include/c++/4.9/ostream:488:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:493:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)
     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
     ^
/usr/include/c++/4.9/ostream:493:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:513:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
     ^
/usr/include/c++/4.9/ostream:513:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/ostream:609:0,
                 from /usr/include/c++/4.9/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.9/bits/ostream.tcc:321:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/4.9/bits/ostream.tcc:321:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:530:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)
     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/4.9/ostream:530:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:543:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)
     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
     ^
/usr/include/c++/4.9/ostream:543:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:548:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)
     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
     ^
/usr/include/c++/4.9/ostream:548:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:602:5: note: template<class _CharT, class _Traits, class _Tp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^
/usr/include/c++/4.9/ostream:602:5: note:   template argument deduction/substitution failed:
prog.cpp:19:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num1; // value storage for user entered value of first integer
        ^
prog.cpp:22:5: error: no match for 'operator<<' (operand types are 'std::istream {aka std::basic_istream<char>}' and 'int')
 cin << num2; // value storage for user entered value of second integer
     ^
prog.cpp:22:5: note: candidates are:
In file included from /usr/include/c++/4.9/string:52:0,
                 from /usr/include/c++/4.9/bits/locale_classes.h:40,
                 from /usr/include/c++/4.9/bits/ios_base.h:41,
                 from /usr/include/c++/4.9/ios:42,
                 from /usr/include/c++/4.9/ostream:38,
                 from /usr/include/c++/4.9/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.9/bits/basic_string.h:2772:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<<(basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/4.9/bits/basic_string.h:2772:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:471:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
     ^
/usr/include/c++/4.9/ostream:471:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:476:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
     ^
/usr/include/c++/4.9/ostream:476:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:482:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)
     operator<<(basic_ostream<char, _Traits>& __out, char __c)
     ^
/usr/include/c++/4.9/ostream:482:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:488:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)
     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
     ^
/usr/include/c++/4.9/ostream:488:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:493:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)
     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
     ^
/usr/include/c++/4.9/ostream:493:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:513:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
     ^
/usr/include/c++/4.9/ostream:513:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/ostream:609:0,
                 from /usr/include/c++/4.9/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.9/bits/ostream.tcc:321:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/4.9/bits/ostream.tcc:321:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:530:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)
     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/4.9/ostream:530:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:543:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)
     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
     ^
/usr/include/c++/4.9/ostream:543:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:548:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)
     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
     ^
/usr/include/c++/4.9/ostream:548:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:602:5: note: template<class _CharT, class _Traits, class _Tp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^
/usr/include/c++/4.9/ostream:602:5: note:   template argument deduction/substitution failed:
prog.cpp:22:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num2; // value storage for user entered value of second integer
        ^
prog.cpp:25:5: error: no match for 'operator<<' (operand types are 'std::istream {aka std::basic_istream<char>}' and 'int')
 cin << num3; // value storage for user entered value of third integer
     ^
prog.cpp:25:5: note: candidates are:
In file included from /usr/include/c++/4.9/string:52:0,
                 from /usr/include/c++/4.9/bits/locale_classes.h:40,
                 from /usr/include/c++/4.9/bits/ios_base.h:41,
                 from /usr/include/c++/4.9/ios:42,
                 from /usr/include/c++/4.9/ostream:38,
                 from /usr/include/c++/4.9/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.9/bits/basic_string.h:2772:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<<(basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/4.9/bits/basic_string.h:2772:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:471:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
     ^
/usr/include/c++/4.9/ostream:471:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:476:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
     ^
/usr/include/c++/4.9/ostream:476:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:482:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)
     operator<<(basic_ostream<char, _Traits>& __out, char __c)
     ^
/usr/include/c++/4.9/ostream:482:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:488:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)
     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
     ^
/usr/include/c++/4.9/ostream:488:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:493:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)
     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
     ^
/usr/include/c++/4.9/ostream:493:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:513:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
     ^
/usr/include/c++/4.9/ostream:513:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/ostream:609:0,
                 from /usr/include/c++/4.9/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.9/bits/ostream.tcc:321:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/4.9/bits/ostream.tcc:321:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:530:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)
     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/4.9/ostream:530:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:543:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)
     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
     ^
/usr/include/c++/4.9/ostream:543:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:548:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)
     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
     ^
/usr/include/c++/4.9/ostream:548:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/ostream:602:5: note: template<class _CharT, class _Traits, class _Tp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^
/usr/include/c++/4.9/ostream:602:5: note:   template argument deduction/substitution failed:
prog.cpp:25:8: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
 cin << num3; // value storage for user entered value of third integer
        ^
prog.cpp:27:25: error: expected ';' before 'end1'
 cout << "Great thanks!" end1;
                         ^
prog.cpp:34:21: error: 'end1' is not a member of 'std'
 cout << smallest << std::end1; // read value "smallest"
                     ^
prog.cpp:41:20: error: 'end1' is not a member of 'std'
 cout << largest << std::end1; // read value "largest"
                    ^
prog.cpp:50:37: error: 'end1' is not a member of 'std'
 cout << "Product is " << product << std::end1; // product value read out
                                     ^

Standard output is empty