hduoj1095,A+B for Input-Output Practice (VII)

A+B for Input-Output Practice (VII)

Problem Description
Your task is to Calculate a + b.
 
Input
The input will consist of a series of pairs of integers a and b, separated by a space, one pair of integers per line. 
 
Output
For each pair of input integers a and b you should output the sum of a and b, and followed by a blank line. 
 
Sample Input
1 5
10 20
 
Sample Output
6

30

code:

#include<iostream>
using namespace std;
int main()
{
    int a,b,sum;
    while(cin>>a>>b)
    {
        sum=0;
        sum=a+b;
        cout<<sum<<endl<<endl;
    }
    return 0;
}