Square Area: Struct & methods

let us look at area of a square  in rust using struct & methods

main.rs

use std::fmt;

struct Square {
    side: i32
}

impl fmt::Display for Square {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Square of side {}", self.side)
    }
}
impl Square {

fn area(&self) -> i32 {

   let x = self.side;
   x*x
 }
}

fn main() {
    let square = Square { side: 4 };
    println!("{}", square.to_string());
    
     println!("Square area: {}", square.area());
}

Cargo.toml

[package]
name = "rust_square"
version = "0.1.0"
authors = ["bhagvan.kommadi"]
edition = "2018"

[dependencies]

Run the following command:

cargo run

The screenshot of the output will look like this: