#include<stdio.h>
int main(void)
{
    long num;
    long sum=0L;
    int status ;
   
    printf("Please enter an integer to bo summed");
    printf("q to quit):");
    status=scanf("%ld",&num);
    while(status==1)
    {
        sum=sum+sum;
        printf("Please enter next integer(q to quit)");
        status=scanf("%ld",&sum);
    }
    printf("Those integers sum to %ld.\n",sum);
    return 0;
}

status=scanf("%ld",&sum);
输入如 10 . status 的值就等于10.
while(status==1)
10不等价于1啊。怎么会继续循环呢？
%ld 输入10 ，结果是1吗？

会返回一个数的。

[ 本帖最后由 topki 于 2011-6-18 21:27 编辑 ]

#include<stdio.h>
int main(void)
{
    long num;
    long sum=0L;
    int status ;
   
    printf("Please enter an integer to bo summed");
    printf("q to quit):");
    status=scanf("%ld",&num);
    while(status==1)
    {
        sum=sum+num;
        printf("Please enter next integer(q to quit)");
        status=scanf("%d",&num);
        printf("%d",status);
    }
    printf("Those integers sum to %ld.\n",sum);
    return 0;
}

打错了。这个才对。把输入的数字加起来