//تشابتر4 ملف السويتش
var grade = "PREMIUM";


switch (grade){

case "REGULAR":
    alert ("it is $3.15");

break;

case "PREMIUM":
    alert ("it is $3.35");

break;

case "DIESEL":
    alert ("it is $3.47");

break;

  default:
 alert("THAT IS NOT VALID GRADE")





}
==================================================================
///تشابتر 5 اول ملف
function myfunction(){

var a = 5;

var b = 10;

var c = 20;

var d = a + b + c;


alert("The value of d is: " + d );




}
myfunction();
myfunction();
myfunction();
myfunction();
myfunction();

==================================================================

///تشابتر 5 ثاني ملف
function addTwoNumbers(a,b){


        var result = a + b;

    return result;
}
var x = addTwoNumbers(5,10);
alert(x);


addTwoNumbers(500,100);

     addTwoNumbers(7,-2323);
==================================================================

///تشابتر 6
var amount =0;
// create the index

var i=0;
// chick condition

while (i<=10){
amount = amount +100;


//incremant index


i++;

}

alert("the value is:" + amount);