>>782 こんな感じかなぁ。なんの意味があるのか。。。
#include <iostream>

int a, b, m;

void func(void)
{
switch(m){
case 0: cout << a << " + " << b << " = " << a + b << endl; break;
case 1: cout << a << " - " << b << " = " << a - b << endl; break;
case 2: cout << a << " * " << b << " = " << a * b << endl; break;
case 3: cout << a << " / " << b << " = " << a / b << endl; break;
};
}
int main(void)
{
cin >> a >> b >> m;
cout << endl;
if(a && b){ func(); }
return 0;
}