seoh / pseudo-random-yellowbook

A yellow-book of pseudo-random generation of modern programming languages

pseudo-random-yellowbook

A yellow-book of pseudo-random number generation of modern programming languages.

List ordering follows TIOBE Index.

Language	Module	1 <= integer <= 10	0 <= float < 100
C	stdlib.h	rand() % 10 + 1	rand() / (float)RAND_MAX * 100
Python	random	random.randint(1, 10)	random.random() * 100
Java	java.util.Random	new Random().nextInt(10) + 1	new Random().nextFloat() * 100
C++	<random>	std::random_device rd; std::mt19937 gen(rd()); std::uniform_int_distribution<int> dist(1, 10); dist(gen);	std::random_device rd; std::mt19937 gen(rd()); std::uniform_real_distribution<float> dist(0.0f, 100.0f); dist(gen);
C#	System	new Random().Next(1, 11)	new Random().NextDouble() * 100
Visual Basic	VBMath	CInt(Int((Rnd() * 10) + 1))	Rnd() * 100
JavaScript	Math	Math.floor(Math.random() * 10) + 1	Math.random() * 100
Assembly
PHP	Math (core)	mt_rand(1, 10)	mt_rand() / (float)(mt_getrandmax() + 1) * 100
SQL	-	TRUNC(RANDOM() * 10) + 1	RANDOM() * 100
Ruby	Random	rand(10) + 1	rand * 100
Go	math/rand	rand.Intn(10) + 1	rand.Float64() * 100
Swift	Swift Standard Library	Int.random(in: 1...10)	Float.random(in: 0..<100)
MATLAB	intrinsic	randi(10)	rand * 100.0
Fortran	intrinsic	CALL RANDOM_NUMBER(r); i = ceiling(r*10)	CALL RANDOM_NUMBER(r); r = r*100
R	base, stats	sample(1:10, 1)	runif(1, 0, 100)
Perl
Delphi
Rust	rand::Rng	rand::thread_rng().gen_range(1..=10);	rand::thread_rng().gen_range(0.0..100.0) as f32;
Julia	Random	abs(rand(UInt64)) % 10 + 1	abs(rand(Float64)) * 100
Scala	scala.util.Random	Random.nextInt(10) + 1	Random.between(0f, 100f)
Clojure	clojure.core/rand clojure.core/rand-int	(+ (rand-int 10) 1)	(rand 100)
Bash	$RANDOM	$(( $RANDOM % 10 + 1 ))	$(( $RANDOM / 32768.0 * 100 ))

SQL

Random function is not present in ANSI SQL standard and should be specified in accordance with respective implementations.

• PostgreSQL: RANDOM
• MySQL: RAND

Fortran

• i is INTEGER and r is REAL.
• Declare output variable first and pass it to RANDOM_NUMBER.

    PROGRAM test_random_number
        REAL :: r
        CALL RANDOM_NUMBER(r)
    END PROGRAM

Bash

$RANDOM returns an integer in the range 0 ~ 32767. To get a floating number in range of [0..1), divide it by 32768.