大一c语言实验，不可字符串和数组

Question

c语言实验题，不可用字符串，不可用数组，求解答，比较急，求帮助

Answer 1

不能用字符串，那可以两个办法，一是一个大整数，二是getchar逐个字符接收处理，没说不让用字符吧？不过题意应该是大整数。17位，用long long就可以了

int main()
{

    int N;
    scanf("%d",&N);
    for(int i=1;i<=N;i++)
    {
        long long n;
        scanf("%lld",&n);
        long long a = n;
        int m = n%10;
        n = n/10;
        long long t = pow(10.0,16);
        int k = 16;
        int sum = 0;
        while(n>0)
        {
            int s;
            switch(k)
            {
            case 16:
                s = 7;
                break;
            case 15:
                s = 9;
                break;
            case 14:
                s = 10;
                break;
            case 13:
                s = 5;
                break;
            case 12:
                s = 8;
                break;
            case 11:
                s = 4;
                break;
            case 10:
                s = 2;
                break;
            case 9:
                s = 1;
                break;
            case 8:
                s = 6;
                break;
            case 7:
                s = 3;
                break;
            case 6:
                s = 7;
                break;
            case 5:
                s = 9;
                break;
            case 4:
                s = 10;
                break;
            case 3:
                s = 5;
                break;
            case 2:
                s = 8;
                break;
            case 1:
                s = 4;
                break;
            case 0:
                s = 2;
                break;
            }
            sum += n/t*s;
            n%=t;
            t/=10;    
            k--;
        }
        sum%=11;
        int M = 0; 
        if(sum == 0)
            M = 1;
        else if(sum == 1)
            M = 2;
        else if(sum >= 3)
            M = 12-sum;
        if(M == m)
            printf("%lld Passed",a);
        else
            printf("%lld Fail",a);
        printf("\n");
    }
}