C语言中如何实现多组数据输入输出

仔细认真看看下面的会对你有帮助的，嘿嘿
输入格式：有多个case输入，直到文件结束
输出格式：一行一个结果
Problem Description
Your task is to Calculate a + b.
Too easy?! Of course! I specially designed the problem for acm beginners.