A+B for Input-Output Practice (I)

Your task is to Calculate a + b.
Too easy?! Of course! I specially designed the problem for acm beginners.
You must have found that some problems have the same titles with this one, yes, all these problems were designed for the same aim.
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 in one line, and with one line of output for each line in input.
Sample Input
1 5
10 20
Sample Output
6
30
问题来源：https://vjudge.net/problem/HDU-1089
问题分析：。。。简单
代码：分别输入a，b，然后输出a+b。
AC通过的代码如下：

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