ACM 10494 - If We Were a Child Again

#include <stdio.h>

int main()
{
    int i, b = 10, first;
    char ch[2], m[10000], c;
    long long int tmp, j, n; 
    
    while (scanf("%s %s %lld", m, ch, &n) == 3)
    {
        first = 1;  
        if (ch[0] == '/')
        {
            tmp = 0;
            for (i = 0; (c = m[i]); i ++)
            {
                tmp *= b;
                tmp += c - '0';
                j = tmp / n;
                if (j != 0) first = 0;
                if (!first) printf("%lld", j);
                tmp %= n;
            }
            if (first) printf("0");
            printf("\n");
        }
        if (ch[0] == '%')
        {
            for (i = 0, tmp = 0; (c = m[i]); i ++)
            {
                tmp *= b;
                tmp += c - '0';
                tmp %= n;
            }
            printf("%lld\n", tmp);
        }
    }
    return 0;
}

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