RUMO9S.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX 100
#define MAX_STRING 1000

int main()
{
    int i;
    char nums[MAX][MAX_STRING];

    for(i = 0;; i++) {
        scanf("%s", nums[i]);

        if(atoi(nums[i]) == 0)
            break;
    }

    for(i = 0; atoi(nums[i]) != 0; i++) {
        int soma = 0, grau = 0, j, __maxsize = strlen(nums[i]);

        for(j = 0; j < __maxsize; j++) {
            soma += nums[i][j] - '0';
            grau++;
        }

        if((soma%9) == 0)
            printf("%s is a multiple of 9 and has 9-degree %d.", nums[i], grau);
        else
            printf("%s is not a multiple of 9.", nums[i]);

        printf("\n");
    }

    return 0;
}