分数化小数（C++）

#include<iostream>
#include<cmath>
using namespace std;
int main() {
	int a, b, c, m;
	int con[100];
	cin >> a >> b >> c;
	while (a != 0 && b != 0 && c != 0) {
		cout << a / b << ".";

		m = a % b;
		for (int i = 0; i <= c; i++) {
			con[i] = m * 10 / b;
			m = m * 10 % b;
		}
		if (con[c] >= 5)
		{
			con[c - 1]++;
			for (int i = c - 1; i >= 0; i--)
				if (con[i] == 0 && con[i + 1] >= 5 && i - 1 >= 0) con[i - 1]++;
		}
		for (int i = 0; i < c; i++)
			cout << con[i] ;
		cout << endl;
		cin >> a >> b >> c;
	}
	return 0;
}