c++第一次实验

#include <iostream>  
using namespace std;  
int main( )  
{     
    int a,b,sum,sub;  
    cin>>a>>b;//输入两个整数;
    sum=a+b; 
	sub=a-b;
    cout<<"a+b="<<sum<<endl;
	cout<<"a-b="<<sub<<endl; 
    return 0;  
}