想知道哪里错了 应该怎么改

Question

Answer 1

代码如下：

#include <stdio.h>
int main()
{
    int n,sum=0;
    do 
    {
        scanf("%d",&n);
        if( n/100%10 == 3)
            sum += n;
    } while (n != 0);
    printf("sum=%d\n",sum);
    return 0;
}

或者：

#include <stdio.h>
int main()
{
    int n,sum=0;
    scanf("%d",&n);
    while(n != 0)
    {
        if( n/100%10 == 3)
            sum += n;
        scanf("%d",&n);
    }
    printf("sum=%d\n",sum);
    return 0;
}