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Rust program to generate a floating-point random number between a specific range

Rust | Random Numbers Example: Write a program to generate a floating-point random number between a specific range.
Submitted by Nidhi, on November 12, 2021

Problem Solution:

In this program, we will generate a floating-point random number using the gen_range() method between the specified range 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 a floating-point random number between the specific range is given below. The given program is compiled and executed on UBUNTU 18.04 successfully.

// Rust program to generate a floating-point 
// random number between a specific range.

use rand::Rng;

fn main() {
    let mut range = rand::thread_rng();  
    println!("Float random number: {}", range.gen_range(10.5,20.6));
}

Output:

$random> cargo run
Compiling random v0.1.0 (/home/arvind/Desktop/rust/random)
    Finished dev [unoptimized + debuginfo] target(s) in 0.29s
     Running `target/debug/random`

Float random number: 15.180497931347297

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 a floating-point integer number between the specified range using the gen_range() method and printed the result.

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