Code:
function ave()
{
var num1=prompt("enter your first grade");
document.write("<br>ENG121:"+num1);
var num2=prompt("enter your second grade");
document.write("<br>ACC101:"+num2);
var num3=prompt("enter your third grade");
document.write("<br>CS201:"+num3);
var num4=prompt("enter your fourth grade");
document.write("<br>LIT111:"+num4);