[RUST/COMMON] impl 키워드 : 구조체 메소드 정의하기

■ impl 키워드를 사용해 구조체의 메소드를 정의하는 방법을 보여준다.

▶ 예제 코드 (RS)


struct Body
{
    height : f64,
    weight : f64
}

impl Body
{
    fn calculate_bmi(&self) -> f64
    {
        let height : f64 = self.height / 100.0;

        return self.weight / height.powf(2.0);
    }

    fn calculate_bmi_percentage(&self) -> f64
    {
        return self.calculate_bmi() / 22.0 * 100.0;
    }
}

fn main()
{
    let person1 : Body  = Body
    {
        height : 160.0,
        weight : 70.0
    };

    println!("BMI    : {:.2}" , person1.calculate_bmi()           );
    println!("비만율 : {:.1}%", person1.calculate_bmi_percentage());
}

/*
BMI    : 27.34
비만율 : 124.3%
*/

struct Body

{

height : f64,

weight : f64

}

impl Body

{

fn calculate_bmi(&self) -> f64

{

let height : f64 = self.height / 100.0;

return self.weight / height.powf(2.0);

}

fn calculate_bmi_percentage(&self) -> f64

{

return self.calculate_bmi() / 22.0 * 100.0;

}

fn main()

{

let person1 : Body = Body

{

height : 160.0,

weight : 70.0

};

println!("BMI : {:.2}" , person1.calculate_bmi() );

println!("비만율 : {:.1}%", person1.calculate_bmi_percentage());

}

BMI : 27.34

비만율 : 124.3%