جواب تمرین

    function Person(name, age, height, weight, sex, hairColor, BMI) {
        this.name = name;
        this.age = age;
        this.height = function () {
            return height / 100;
        };
        this.weight = weight;
        this.sex = sex;
        this.hairColor = hairColor;
        this.sayName = function () {
            return 'Your name is ' + nameUpperCase(this.name);
        }
    }
    function nameUpperCase(str) {
        return str[0].toUpperCase() + str.slice(1);
    }
    
    let x = new Person(prompt("What's your name?"), prompt('How old are you ?'), prompt("How tall are you ?"), prompt("What's your weight ?"), prompt("What's your sex ?"), prompt("What's your hair color ?"));
    console.log(x.sayName(), ` ,you're ${x.age} years old,`, `you're height is ${x.height() + "m"},`, `you're weight is ${x.weight},`, `you're sex is ${x.sex},`, `you're color is ${x.hairColor}`);


    let heiGht = x.height();
    let weiGht = x.weight;

    console.log("your height is : " + heiGht + " m" );
    console.log("your weight is : " + weiGht + " kg" );

    let BMI = Math.ceil(weiGht / Math.pow(heiGht,2));
    console.log("you're BMI is : " + BMI );