Question

How to fill a vector with random numbers in Rust

Answer 1

use rand::Rng;

fn fill_vector_with_random_numbers(size: usize, min: i32, max: i32) -> Vec<i32> {
    let mut vec = Vec::with_capacity(size);
    let mut rng = rand::thread_rng();

    for _ in 0..size {
        let random_number = rng.gen_range(min..=max);
        vec.push(random_number);
    }

    vec
}

fn main() {
    let size = 7;
    let min = 20;
    let max = 50;
    
    let random_vec = fill_vector_with_random_numbers(size, min, max);
    
    println!("{:?}", random_vec);
}

 
  
/*
run:
  
[34, 35, 25, 27, 30, 26, 28]
 
*/

 

70+ SQL courses for beginners and professionals

Answer 2

use rand::Rng;

fn main() {
    let vec_size = 10;  
    let mut random_vec = vec![0; vec_size];  
    
    // Fill the array with random numbers
    let mut rng = rand::thread_rng();
    for element in &mut random_vec {
        *element = rng.gen_range(4..32); 
    }
    
    println!("{:?}", random_vec);
}

 
  
/*
run:
  
[8, 14, 13, 12, 16, 20, 18, 5, 30, 18]
 
*/

 

70+ SQL courses for beginners and professionals