#include <stdio.h>
void two(unsigned long n);

int main(void)
{
    unsigned long n;

    while((scanf("%d",&n))==1)
    {
        printf("two jinzhi:");
        two(n);
        putchar('\n');
    }
    putchar('done');
    return 0;
}


void two(unsigned long n)
{
    int r;

    r=n%2;
    if(n>=2)
        two(n/2);
    putchar(r+'0');
    return;
}
为什么putcahr要这么編

这是进行的是括号里面十进制相加，然后在输出对应的ASCII值的字符