function Person(name ,age ,height ,weight) {
            this.name = name.replace(name[0] ,name[0].toUpperCase());
            this.age = age;
            this.height = height;
            this.weight = weight;
            this.sayHi = function () {
                return "Hi Dear.";
            }
            this.sayName = function () {
                return "My name is: ".concat(name);
            }
            this.sayBMI = function () {
                return (this.weight/(this.height/100)**2).toFixed(2);
            }
        }
        let ali = new Person("ali" ,25 ,180 ,75);
        console.log(ali.name.concat(
        "\n" ,ali.age 
        ,"\n" ,ali.height 
        ,"\n" ,ali.weight
        ,"\n" ,ali.sayHi()
        ,"\n" ,ali.sayName()
        ,"\n" ,ali.sayBMI()
        ));