Parameters और Return Values

// Define the function `greet_person` taking `name`
fn greet_person(name: &str) {
    // Print "Hello, {}!" to the console, substituting in `name` (with a trailing newline)
    println!("Hello, {}!", name);
}

// Entry point: execution of the program starts here
fn main() {
    greet_person("Ada");
}

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// Define the function `square` taking `n` and returning an integer
fn square(n: i32) -> i32 {
    n * n
}

// Entry point: execution of the program starts here
fn main() {
    // Print "Square of 6 is {}" to the console, substituting in `square(6)` (with a trailing newline)
    println!("Square of 6 is {}", square(6));
}

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// Define the function `add` taking `a`, `b` and returning an integer
fn add(a: i32, b: i32) -> i32 {
    a + b
}

// Entry point: execution of the program starts here
fn main() {
    // Print "3 + 4 = {}" to the console, substituting in `add(3, 4)` (with a trailing newline)
    println!("3 + 4 = {}", add(3, 4));
}

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// Define the function `absolute_value` taking `n` and returning an integer
fn absolute_value(n: i32) -> i32 {
    // Check whether `n < 0`
    if n < 0 {
        // Return `-n` from this function
        return -n;
    }
    n
}

// Entry point: execution of the program starts here
fn main() {
    // Print "abs(-8) = {}" to the console, substituting in `absolute_value(-8)` (with a trailing newline)
    println!("abs(-8) = {}", absolute_value(-8));
}

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