// Think CS ch. 4 examples
#include <iostream>
#include <cmath>
#include <ctime>
using namespace std;

int main () {
    
    srand(time(NULL));
    for (int i = 1; i <= 5; i++)
    	cout << (double) rand() / RAND_MAX << endl;
    
	int X = 0;
	if (X = 0) { // note error!  "=" instead of "=="
		cout << "It's zero\n";
	} else {
		cout << "It's not zero\n";
	}
	X = 6;
	if (X = 6) {
		cout << "It's zero\n";
	} else {
		cout << "It's not zero\n";
	}
    return 0;
}