Update a 2d array in Rust

rust_update_2d_array.rs

fn main() {
    let mut mar = [[1, 3, 5], [2, 4, 6], [7, 8, 9]];

    for row in mar.iter_mut() {
        for num in row.iter_mut() {
            *num += 5;
            print!("{:?} ", num)
        }
    }
}