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How can I generate a random number within a range in Rust?

To get a random number, you can simply do the following.

extern crate rand;

fn main() {
    let i: i32 = rand::random();
    println!("The random i32 is {}", i);
}

In Rust The random() function is smart enough to know the primitive type it is supposed to generate.

Get a series of random numbers


In order to generate a series of random numbers, you can use the random() function multiple times. The draw back of this is slow performance since every time it needs to instantiate and seed a new random number generator. It is faster to create the generator once and call its gen() function repeatedly.

extern crate rand;

use rand::thread_rng;
use rand::Rng;

fn main() {
    let mut rng = thread_rng();
    for i in 1..10 {
        println!("Random number #{}: {}", i, rng.gen_range(0, 100));
    }
}


Conclusion

In this page (written and validated by ) you learned about How can I generate a random number within a range in Rust? . What's Next? If you are interested in completing Rust tutorial, we encourage you simply to start here: Rust Tutorial.



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