Rust Functions

fn main(){ let mut arr:[i32; 5] = [2,4,6,8,10]; multiply(arr); println!("The array is : {:?}", multiply(arr)); } fn multiply (mut arr: [i32 ; 5]) -> [i32 ; 5]{ arr[2] = 90; for mut i in 0..5 { arr[i] = arr[i] * arr[2]; } return arr; } 

fn main(){ let mut array: [i32 ; 5] = [1,2,3,4,6]; print\_arrays(array); println!("The elements: {array:?}"); } fn print\_arrays(mut array:[i32; 5]) { array[0] = 89; array[1] = 90; array[2] = 91; array[3] = 92; array[4] = 93; println!("The elements: {array:?}"); } 

fn main(){ let (mut radius, mut pi) = (3.0, 3.14); let(area, _perimeter) = calculate ( &mut radius, &mut pi ); println!("The area and the perimeter of the circle are: {area} & {\_perimeter}"); } fn calculate(radius : &mut f64, pi: &mut f64) -> (f64, f64){ let perimeter = 2.0 * *pi * *radius; let area = *pi * *radius * *radius; return (area, perimeter); } 

fn main(){ let mut by\_ref = 3; // => 3 power\_of\_three(&mut by_ref); println!("{by\_ref}"); // => 9 } fn power\_of\_three(by_ref: &mut i32){ // de-referencing is important *by_ref = *by_ref * *by_ref; println!("{by\_ref}"); // => 9 } 

fn main() { let x:u32 = 10; let y:u32 = 20; // => 200 println!("Calc: {}", cal\_rect(x, y)); } fn cal\_rect(x:u32, y:u32) -> u32 { x * y } 

fn print\_message(){ println!("Hello, QuickRef.ME!"); } fn main(){ //Invoking a function in Rust. print\_message(); }