ex0402.cpp

teach yourself C++ in 21 days 第五版

#include <iostream>
using namespace std;
int main()
{
     int a, b, c;
     cout << "Please enter three numbers\n";
     cout << "a: ";
     cin >> a;
     cout << "\nb: ";
     cin >> b;
     cout << "\nc: ";
     cin >> c;

     if (c = (a-b))
          cout << "a: " << a << " minus b: " << b << 
                                 " equals c: " << c;
     else
          cout << "a-b does not equal c: ";
   return 0;
}