浙大ZOJ 1001 C语言a+b问题

原题如下
A + B Problem

Time Limit: 2 Seconds Memory Limit: 65536 KB

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 in one line,and with one line of output for
each line in input.
Sample Input
1 5

Sample Output
6

Hint
Use + operator

我的答案是
#include
int main(){
int a,b;
scanf("%d %d",&a,&b);
printf("%d\n",a+b);

return 0;
}

但是不对请问不对在哪里

ZOJ给出的答案如下
#include

int main()
{
int a,b;
while(scanf("%d %d",&a, &b) != EOF)
printf("%d\n",a+b);
return 0;
}

求讲解下while(scanf("%d %d",&a, &b) != EOF)的意义 为什么要添加才对？

while(scanf("%d %d",&a, &b) != EOF)这一句可以让你实现多组a b的输入 （EOF是End Of file的缩写） 按你的写法输入一组a+b之后程序就会终止 OJ无法实现多组输入 当然判错啦

while(scanf("%d,%d",&a,&b)!=-1); 一直在等待输入； 没有执行到下一步。 改成 scanf("%d,%d",&a,&b); printf("%d",a+b); 试试