Functions in Rust

[[Function]] definition consists of a [[function name]], [[return type]], [[parameters]] and the [[function body]].

Rust language uses [[snake case]] naming style - all letters are in lower case and words are sperated by _.

We use fn keyword to define a function. Functions can be defined anywhere in the program.

fn function_name( argument list ) -> (return_type1, return_type2) {
    // statements
}

For example

fn add(a:i32, b:i32) {
    return a +b
}

fn add(a:i32, b:i32) -> i32 {
    return a +b
}

fn sub_add(a:i32, b:i32) -> (i32, i32) {
    return (a-b, a+b)
}

The functions can also be nested:

fn main() {

    fn sub_add(a:i32, b:i32) -> (i32, i32) {
    return (a-b, a+b)
}

    println!("{:?}", sub_add(1,2))

}