c语言题目,要方法就可以了,按照下面方法对整数x进行分类：如果x是一个个位数,则x属于x类；否则将x

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#include <stdio.h>
int main()
{        char str[500];
        char *cp;
        int sum, sum2;
        while(scanf("%s", str)!=EOF)
        {
                cp = str;
                sum = sum2 = 0;
                if(*cp=='0' && *(cp+1)=='\0')
                        break;
                while(*cp != '\0')
                {
                        sum += *cp-'0';
                        cp++;
                }
                while(sum>9)
                {
                        sum2 += sum%10;
                        sum /= 10;
                        if(sum<10)
                        {
                  &nbs