algorithm exercise

specify_decimal_digits_precise.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;

		printf("Case %d: %d", T++, a / b);
		if (c == 0) { printf("\n"); continue; }
		else { printf("."); }

		auto remainderNum = a % b;
		for (int i = 0; i < c - 1; i++)
		{
			remainderNum *= 10;
			printf("%d", remainderNum / b);
			remainderNum %= b;
		}

		auto tail = remainderNum * 100 / b + 5;
		printf("%d\n", tail / 10);
	}
	return 0;
}