Day39:Generate random value - 100DayOfRust

rand="0.7.3" 

use rand::{prelude::*, Rng, distributions::Alphanumeric}; // Rng stands for "random number generator" fn main() { let num: u32 = rand::random(); println!("generated rand integer: {}", num); let c: char = rand::random(); println!("generated rand char: {}", c); let mut rng = rand::thread_rng(); // gen function is a generic-type function let b1: bool = rng.gen(); println!("generated boolean is {}", b1); let n1: u32 = rng.gen(); println!("generated integer is {}", n1); let f1: f32 = rng.gen(); println!("generated float is {}", f1); // generate number within range let range_num = rng.gen_range(0, 10); println!("number b/t 0-10 is {}", range_num); let range_decimal = rng.gen_range(0.0, 1.0); println!("number b/t 0-1 is {}", range_decimal); // generate a string with specified length let rand_str: String = rng.sample_iter(&Alphanumeric).take(15).collect(); println!("generated random string: {}", rand_str); // shuffle some array let mut nums: Vec<i32> = (1..10).collect(); // .shuffle need rand::prelude::* nums.shuffle(&mut rng); println!("num list: {:?}", nums); } 

generated rand integer: 2802536511 generated rand char: 񭌀 generated boolean is true generated integer is 497331788 generated float is 0.0054394007 number b/t 0-10 is 3 number b/t 0-1 is 0.23074173856274816 generated random string: 97lbEyO3SVJgt7k num list: [8, 1, 2, 3, 5, 4, 9, 6, 7]