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#include <iostream>
 
void swap(int *x, int *y);
 
int main() {
    int a, b;
    a = 5;  
    b = 10; 
    cout << "a = " << a << endl;
    cout << "b = " << b << endl;
    cout << "&a = " << &a << endl;
    cout << "&b = " << &b << endl;
 
    swap(a, b); 
    cout << endl;
    cout << "a = " << a << endl;
    cout << "b = " << b << endl;
 
    return 0;
}
 
void swap(int *x, int *y){
    cout << "Hello" << endl;
    cout << "x = " << x << endl;
    cout << "y = " << y << endl;
    int temp;
    temp = *x; 
    *x = *y; 
    *y =temp;
}

prog.cpp: In function ‘int main()’:
prog.cpp:9:5: error: ‘cout’ was not declared in this scope
     cout << "a = " << a << endl;
     ^~~~
prog.cpp:9:5: note: suggested alternative:
In file included from prog.cpp:1:0:
/usr/include/c++/6/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~
prog.cpp:9:28: error: ‘endl’ was not declared in this scope
     cout << "a = " << a << endl;
                            ^~~~
prog.cpp:9:28: note: suggested alternative:
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:590:5: note:   ‘std::endl’
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^~~~
prog.cpp:14:14: error: invalid conversion from ‘int’ to ‘int*’ [-fpermissive]
     swap(a, b);
              ^
prog.cpp:3:6: note:   initializing argument 1 of ‘void swap(int*, int*)’
 void swap(int *x, int *y);
      ^~~~
prog.cpp:14:14: error: invalid conversion from ‘int’ to ‘int*’ [-fpermissive]
     swap(a, b);
              ^
prog.cpp:3:6: note:   initializing argument 2 of ‘void swap(int*, int*)’
 void swap(int *x, int *y);
      ^~~~
prog.cpp: In function ‘void swap(int*, int*)’:
prog.cpp:23:5: error: ‘cout’ was not declared in this scope
     cout << "Hello" << endl;
     ^~~~
prog.cpp:23:5: note: suggested alternative:
In file included from prog.cpp:1:0:
/usr/include/c++/6/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~
prog.cpp:23:24: error: ‘endl’ was not declared in this scope
     cout << "Hello" << endl;
                        ^~~~
prog.cpp:23:24: note: suggested alternative:
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:590:5: note:   ‘std::endl’
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^~~~

Standard output is empty