Question

How to use the clock as a random generator seed in Rust

Answer 1

use rand::{Rng, SeedableRng};
use rand::rngs::StdRng;
use std::time::{SystemTime, UNIX_EPOCH};

fn main() {
    // Get the current time in nanoseconds
    let seed = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .expect("Time went backwards")
        .as_nanos() as u64;

    // Create a seeded RNG
    let mut rng = StdRng::seed_from_u64(seed);

    // Generate a random number
    let random_number1: u32 = rng.random_range(1..=100);
    println!("Random number: {}", random_number1);
    
    let random_number2: u32 = rng.random_range(1..=100);
    println!("Random number: {}", random_number2);
}


 
 
/*
run:
 
Random number: 40
Random number: 98

*/

 

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