#include <stdio.h>
void main()
{
    long intSUM(long k);
    printf("%ld\t",intSUM(7432L));
    printf("%ld\t",intSUM(1234567890L));
}
long intSUM(long k)
{
    long s = 0L;
    do{
        s += k % 10;
        k /=10;
    }while(k);
    return s;
}

求的是整数k每一位数的和。如k = 123；那么s = 3+2+1

intSUM(7432L)=7432%10+743%10+74%10+7%10+0
加到0为止

[此贴子已经被作者于2017-10-8 10:19编辑过]