CC150 5.2

5_2.cpp

/* CC150 5.2
 * Given a real number between 0 and 7 (e.g., 0.72) that is passed in as a double, print the binary representation.
 * If the number cannot be represented accurately in binary with at most 32 characters, print "ERROR."
 */

#include <iostream>
#include <vector>

using namespace std;

bool real2bin(double d, vector<int> &bin)
{
	if (d >= 1 || d <= 0)
		return false;
	int bitCount = 0; // can use bin.size() instead
	while (d != 0 && ++bitCount <= 32) {
		bin.push_back(d >= 0.5);
		d = (d >= 0.5) ? d * 2 - 1 : d * 2;
	}
	if (d == 0) return true;
	else return false;
}

int main()
{
	double d;
	cin >> d;
	vector<int> bin;
	if (!real2bin(d, bin)) {
		cout << "ERROR!" << endl;
//		for (auto i : bin)
//			cout << i;
//		cout << endl;
	}
	else {
		for (auto i : bin)
			cout << i;
		cout << endl;
	}
	return 0;
}