非負數四捨五入

#include <iostream>
#include <cmath>
using namespace std;

int round(double number);

int main() {
	double num;
	char ans;
	
	do {
		cout << "Enter a double value: ";
		cin >> num;
		cout << "Rounded that number is " << round(num) << endl;
		cout << "Again?(y/n):";
		cin >> ans;
	}while(ans == 'y' || ans == 'Y');
	cout << "End of test.\n";
	return 0;
}

int round(double number) {
	return static_cast<int>(floor(number + 0.5));
}