Hare by Example: Random Numbers

Hare has support for generating pseudorandom numbers.

use fmt;
use math::random;

export fn main() void = {
	// Set a seed value and initialize the random state with that
	// seed. Since the seed value is constant all random numbers
	// will end up being the same no matter how many times you run
	// these examples.
	const seed: u64 = 0xdeadbeef;
	const rand = random::init(seed);

	// We can get the next number from the random state.
	let num = random::next(&rand);
	fmt::println(num)!;

	// Calling next again will generate another random number.
	num = random::next(&rand);
	fmt::println(num)!;

	// We can also request a number with an upper bound.
	num = random::u64n(&rand, 10);
	fmt::println(num)!;

	// We can even get a 64-bit float value as well.
	let fnum = random::f64rand(&rand);
	fmt::println(fnum)!;
};

$ hare run random-numbers.ha
5395234354446855067
12431030666585794594
7
0.919617363394144

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