两个小程序的区别
刷题时 一个AC，一个报错

1，报错的程序

#include<stdio.h>

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

return 0;
}

2，AC的程序

#include <stdio.h>
int main() {
    int a,b;
    while (scanf("%d %d",&a, &b) != EOF) {
        printf("%d\n",a+b);
    }
return 0;
}

求大神提点一下
不胜感激
[解决办法]
报错的程序因为超时
[解决办法]
1 报错程序： 遇到EOF， 程序继续循环
2 AC程序： 遇到EOF， 程序结束循环
[解决办法]
Return value
Number of receiving arguments successfully assigned, or EOF if read failure occurs before the first receiving argument was assigned.

EOF is true as it is non-zero.