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Rust program to generate floating-point random numbers

Rust | Random Numbers Examples: Write a program to generate floating-point random numbers.
Submitted by Nidhi, on November 12, 2021

Problem Solution:

In this program, we will generate 8-bit, 16-bit, 32-bit floating-point numbers using the gen() method and print the result.

Add random external library to your project

  1. Create your project using the below command.
    $cargo new random --bin
  2. Goto the project folder cd random and edit Cargo.toml file.
    $random>nano Cargo.toml
  3. Then add dependency in Cargo.toml file
    [dependencies]
    rand = "0.5.5"
  4. After that, build your project using the below command
    $random>cargo build
  5. Then execute your project after modification in the src/main.rs source file.
    $random>cargo run

Program/Source Code:

The source code to generate floating-point random numbers is given below. The given program is compiled and executed on UBUNTU 18.04 successfully.

// Rust program to generate floating-point 
// random numbers

use rand::Rng;

fn main() {
    let mut rng = rand::thread_rng();

    let num32: f32   = rng.gen();
    let num64: f64 = rng.gen();
    
    println!("Random f32: {}", num32 );
    println!("Random f64: {}", num64 );
}

Output:

$random> cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.00s
     Running `target/debug/random`

Random f32: 0.9855966
Random f64: 0.5490820251778854

Explanation:

In the above program, we imported the "rand" library to our project for generating random numbers. We imported the "rand" library using the below line:

use rand::Rng;

In the main() function, we generated 8-bit, 16-bit, 32-bit floating-point numbers using the gen() method and printed the result.

Rust Random Numbers Programs »



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