// random.cpp - simple example of setting random number seeds with time

#include <iostream>
using namespace std;

double rnd(double a, double b) {
	return (b - a)* drand48() + a;	//	return random number from [a, b)
}

int main() {
	srand48(time(nullptr));	//	use time in seconds to set seed

//	lrand48() returns non-negative long integers
//	uniformly distributed over the interval [0, 2^31).

//	drand48() returns non-negative double precision floating-point
//	values  uniformly  distributed  between [0.0, 1.0).

	cout << endl;
	cout << "5 long random numbers:" << endl;
	for (int i = 0; i < 5; ++i) cout << lrand48() << " "; 
	cout << endl;
	cout << endl;

	cout << "5 double random numbers from [0, 1):" << endl;
	for (int i = 0; i < 5; ++i) cout << drand48() << " "; 
	cout << endl;
	cout << endl;

	cout << "5 double random numbers from [-10, 10):" << endl;
	for (int i = 0; i < 5; ++i) cout << rnd(-10., 10.) << " "; 
	cout << endl;
	cout << endl;
	return 0;
}