Decimal

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

int ar[10000], ar2[10000], ar3[10000];

int main()
{
    int lol, t, i, j, k, l, a, b, c, d, x, y, r, z, flag, n, m, count, p;

    for (; ;)
    {
        if (scanf("%d %d", &n, &m) == EOF) break;

        count = 0, lol = n, c = 0, k = 0, flag = 0, l = 0, d = n / m;

        n = n % m;
        for (p = 1; ;p++)
        {
            if (n == 0 || l > 2975) break;

            for (; ;)
            {
                n = n * 10;
                if (n >= m)
                {
                    x = n / m;
                    y = n, z = x;
                    n = n % m;
                    for (r = 0; r < k; r++)
                    {
                        if (ar2[r] == y)
                        {
                            flag = 1;
                            c = r;
                            break;
                        }
                    }
                    if (flag == 1) break;

                    for (; ;)
                    {
                        a = z / 10;
                        ar[l++] = z % 10;
                        z = a;
                        if (a == 0) break;
                    }

                    ar3[k] = l;
                    ar2[k++] = y;
                    break;
                }
                ar[l++] = 0;
            }
            if (flag == 1) break;
        }

        z = 0;
        printf("%d/%d = %d.", lol, m, d);

        if (flag == 0)
        {
            for (i = c; i < l; i++) printf("%d", ar[i]);
            puts("(0)");
            x = 1;
        }

        else
        {
            for (i = 0; i < c; i++) printf("%d", ar[i]);
            printf("(");
            for (z = 1, i = c; i < l; i++,z++)
            {
                if (z == 51) break;
                 printf("%d", ar[i]);
            }
            if (z == 51) puts("...)");
            else puts(")");
            x = l - ar3[c] + 1;
        }
        printf("   %d = number of digits in repeating cycle\n\n", x);
    }
    return 0;
}