Rustlings_functions

Posted 2020-12-10 nightwindnw

练习过程中的随手记,很多问题也未深究,,简单问题可能直接贴改完之后的代码,..分享出来,若能帮助大家,意外乐趣

functions1.rs

// functions1.rs
// Make me compile! Execute `rustlings hint functions1` for hints :)

fn call_me(){

}

fn main() {
    call_me();
}

functions2.rs

// functions2.rs
// Make me compile! Execute `rustlings hint functions2` for hints :)


fn main() {
    call_me(3);
}

fn call_me(num:i32) {
    for i in 0..num {
        println!("Ring! Call number {}", i + 1);
    }
}

functions3.rs

// functions3.rs
// Make me compile! Execute `rustlings hint functions3` for hints :)

fn main() {
    call_me(1);
}

fn call_me(num: i32) {
    for i in 0..num {
        println!("Ring! Call number {}", i + 1);
    }
}

functions4.rs

// functions4.rs
// Make me compile! Execute `rustlings hint functions4` for hints :)

// This store is having a sale where if the price is an even number, you get
// 10 Rustbucks off, but if it‘s an odd number, it‘s 3 Rustbucks off.


fn main() {
    let original_price = 51;
    println!("Your sale price is {}", sale_price(original_price));
}

fn sale_price(price: i32) -> i32 {
    if is_even(price) {
        price - 10
    } else {
        price - 3
    }
}

fn is_even(num: i32) -> bool {
    num % 2 == 0
}

functions5.rs

// functions5.rs
// Make me compile! Execute `rustlings hint functions5` for hints :)


fn main() {
    let answer = square(3);
    println!("The answer is {}", answer);
}

fn square(num: i32) -> i32 {
    num * num
}