algorithm exercise

specify_decimal_digits_notPrecise.cpp

#include <stdio.h>
#include <math.h>

int main()
{
	auto T = 1;
	auto a = 0, b = 0, c = 0;
	while (~scanf("%d%d%d", &a, &b, &c))
	{
		if (a == 0 && b == 0 && c == 0) break;

		auto quotient = static_cast<double>(a) / b;
		auto intPart = static_cast<int>(floor(quotient));
		quotient -= intPart;
		printf("Case %d: %d", T++, intPart);

		if (c == 0) { printf("\n"); continue; }
		else { printf("."); }

		for (int i = 0; i < c - 1; i++)
		{
			quotient *= 10;
			auto singleDigit = static_cast<int>(floor(quotient));
			printf("%d", singleDigit);
			quotient -= singleDigit;
		}

		auto tail = static_cast<int>(floor(quotient * 100)) + 5;
		printf("%d\n", tail / 10);
	}
	return 0;
}