A+B for Input-Output Practice (III)

Problem Description

Your task is to Calculate a + b.

Input

Input contains multiple test cases. Each test case contains a pair of integers a and b, one pair of integers per line. A test case containing 0 0 terminates the input and this test case is not to be processed.

Output

For each pair of input integers a and b you should output the sum of a and b in one line, and with one line of output for each line in input.

Example Input

1 510 200 0

Example Output

630

附代码：

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

代码并不重要，想要记录的重点是新学到的while()的使用方法。