POJ-2710(47/159的七进制表示)(Consecutive Digits)

int main()
{
	int cases, x = 1;
	cin>>cases;
	while (cases--) {
		int a, b, c, d;
		cin>>a>>b>>c>>d;
		printf("Problem set %d: %d / %d, base 7 digits %d through %d: ", x++, a, b, c, d);
		int i;
		a %= b;
		for (i = 0; i <= d; ++i) {
			a *= 7;
			if (i >= c) {
				printf("%d", a / b);
			}
			a %= b;
		}
		printf("\n");
	}
    return 0;
}

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