4章3节使用运算符

#include <iostream>

int main()

{
 using std::cout;
 using std::endl;

 int  difference,bignumber=100,smallnumber=50;
    difference=bignumber-smallnumber;

 cout << "difference= " << difference << endl;

 difference=smallnumber-bignumber;

    cout << "difference= " << difference << endl;

 
     difference=smallnumber-bignumber;

    cout << "difference= " << difference << endl;
 return 0;
}