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#include <iostream>
#include <algorithm>
 
using std::cout;
using std::cin;
using std::min;
using std::max;
 
//returns true if the variance is less than 0.01
bool valuesAreSimilar(double a, double b) {
  return std::abs(a - b) < 0.01;
}
 
int main()
{
    double value02; 
    double value01;
 
    while (cin >> value01 >> value02) {
        if (value01 != value02) {
            cout << "The smaller value is: " << min(value01, value02) 
                << " , the larger value is: " << max(value01, value02) << "\n";
            if (valuesAreSimilar(value01, value02)) {
                cout << "The numbers are almost equal. \n";
            }
        }
        else {
            cout << "Both of these numbers are equal!" << "\n";
        }
    }
    cout << "Not a value I know! Incorrect input" << "\n";
}

prog.cpp: In function 'bool valuesAreSimilar(double, double)':
prog.cpp:11:24: error: call of overloaded 'abs(double)' is ambiguous
   return std::abs(a - b) < 0.01;
                        ^
In file included from /usr/include/c++/5/cstdlib:72:0,
                 from /usr/include/c++/5/bits/stl_algo.h:59,
                 from /usr/include/c++/5/algorithm:62,
                 from prog.cpp:2:
/usr/include/stdlib.h:775:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^
In file included from /usr/include/c++/5/bits/stl_algo.h:59:0,
                 from /usr/include/c++/5/algorithm:62,
                 from prog.cpp:2:
/usr/include/c++/5/cstdlib:166:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^
/usr/include/c++/5/cstdlib:174:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^

Standard output is empty