Function double 

pub fn double(num: i32) -> i32

to compute a double of given number

Examples

let x = 2; println!(“double is : {}”, cube(x));

output : square is : 4

Tests

let n = 5;
let ans = crate_exp::double(n);
 
assert_eq!(10,ans);

Limitation

only for i32 type integers

Other Details

etc etc