c语言程序，打不出来

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

 觉得有用的话采纳一下哈

供参考：

#include <stdio.h>
int main()
{
    int n, s, flg = 0;
    scanf("%d", &n);
    while (1)
    {
        s = 0;
        while (n)
        {
            s += n % 10;
            n /= 10;
        }
        printf(flg++ == 0 ? "%d" : "\n%d", s);
        if (s < 10) break;
        n = s;
    }
    return 0;
}