enum Nat {
    Z,          // Zero
    S(Box<Nat>), // Successor of another Nat
}

// Function to add two natural numbers
fn add(n: &Nat, m: &Nat) -> Nat {
    match n {
        Nat::Z => m.clone(),
        Nat::S(inner_n) => Nat::S(Box::new(add(inner_n, m))),
    }
}

// Function to multiply two natural numbers
fn multiply(n: &Nat, m: &Nat) -> Nat {
    match n {
        Nat::Z => Nat::Z,
        Nat::S(inner_n) => add(m, &multiply(inner_n, m)),
    }
}

// Function to convert an integer to the Nat representation
fn from_integer(num: i32) -> Nat {
    if num <= 0 {
        Nat::Z
    } else {
        Nat::S(Box::new(from_integer(num - 1)))
    }
}

// Function to convert a Nat representation to an integer
fn to_integer(nat: &Nat) -> i32 {
    match nat {
        Nat::Z => 0,
        Nat::S(inner) => 1 + to_integer(inner),
    }
}

fn main() {
    let num1 = from_integer(3);
    let num2 = from_integer(5);

    let sum_result = add(&num1, &num2);
    let mul_result = multiply(&num1, &num2);

    println!("Number 1: {}", to_integer(&num1));
    println!("Number 2: {}", to_integer(&num2));
    println!("Sum result: {}", to_integer(&sum_result));
    println!("Multiplication result: {}", to_integer(&mul_result));
}

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Contributed on Jul 30 2023

Hasan Ali ÖZKAN

0 Answers Avg Quality 2/10

function multiply(a b)

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