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Rust program to generate integer random numbers

Rust | Random Numbers Example: Write a program to generate integer random numbers.
Submitted by Nidhi, on November 12, 2021

Problem Solution:

In this program, we will generate 8-bit, 16-bit, 32-bit integer 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 integer random numbers is given below. The given program is compiled and executed on UBUNTU 18.04 successfully.

// Rust program to generate integer random numbers

use rand::Rng;

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

    let num8: u8   = rng.gen();
    let num16: u16 = rng.gen();
    let num32: u32 = rng.gen();
    
    println!("Random u8 : {}", num8 );
    println!("Random u16: {}", num16);
    println!("Random u32: {}", num32);
}

Output:

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

Random u8 : 7
Random u16: 8397
Random u16: 1476775958

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 unsigned integer numbers using the gen() method and printed the result.

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