eratosthenes with Rust

main.rs

fn main() {
    let num: usize =  100000;
    let mut prime = vec![1; num+1];
    let limit: usize;

    for i in 2..num {
        prime[i] = 1;
    }
    limit = ((num as f64).sqrt() as usize);

    for i in 2..limit {
        if prime[i] == 1 {
            for j in i*2..num {
                if j % i == 0 {
                    prime[j] = 0;
                }
            }
        }
    }
    for i in 2..num {
        if prime[i] == 1 {
            println!("{}", i);
        }
    }
    println!("\n");
}