HDOJ1013 Digital Roots

原题链接

略坑的一道题。

#include <stdio.h>
char str[1000];

int f(int n){
    int s = 0;
    while(n){
        s += n % 10;
        n /= 10;
    }
    return s;
}

int main(){
    int n, s;
    while(scanf("%s", str), str[0] - ‘0‘){
        s = 0;
		for(int i = 0; str[i] != ‘\0‘; ++i)
			s += str[i] - ‘0‘;
        while(s > 9)
            s = f(s);
        printf("%d\n", s);
    }
    return 0;
}

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HDOJ1013 Digital Roots

原文：http://blog.csdn.net/chang_mu/article/details/20957381