index1.js

function cg() {
 var currentCG = document.PresentCG.current_cg.value;
 var tcredits =  document.PresentCG.tpastcredits.value;
 var sub1grade = document.Expected.sub1grade.value;
 var sub1credits = document.Expected.sub1credits.value;
 var sub2grade = document.Expected.sub2grade.value;
 var sub2credits = document.Expected.sub2credits.value;
 var sub3grade = document.Expected.sub3grade.value;
 var sub3credits = document.Expected.sub3credits.value;
 var sub4grade = document.Expected.sub4grade.value;
 var sub4credits = document.Expected.sub4credits.value;
 var sub5grade = document.Expected.sub5grade.value;
 var sub5credits = document.Expected.sub5credits.value;
 var sub6grade = document.Expected.sub6grade.value;
 var sub6credits = document.Expected.sub6credits.value;
 var sub7grade = document.Expected.sub7grade.value;
 var sub7credits = document.Expected.sub7credits.value;
 var sub8grade = document.Expected.sub8grade.value;
 var sub8credits = document.Expected.sub8credits.value;
 var sub9grade = document.Expected.sub9grade.value;
 var sub9credits = document.Expected.sub9credits.value;
 var sub10grade = document.Expected.sub10grade.value;
 var sub10credits = document.Expected.sub10credits.value;
 var sub11grade = document.Expected.sub11grade.value;
 var sub11credits = document.Expected.sub11credits.value;
 var sub12grade = document.Expected.sub12grade.value;
 var sub12credits = document.Expected.sub12credits.value;
 var totalcred = Number(tcredits)+Number(sub1credits)+Number(sub2credits)+Number(sub3credits)+Number(sub4credits)+Number(sub5credits)+Number(sub6credits)+Number(sub7credits)+Number(sub8credits)+Number(sub9credits)+Number(sub10credits)+Number(sub11credits)+Number(sub12credits);
 var weightedcredits = (currentCG*tcredits) + (sub1grade*sub1credits)+ (sub2grade*sub2credits) +(sub3grade*sub3credits)+(sub4grade*sub4credits)+ (sub5grade*sub5credits)+(sub6grade*sub6credits)+sub7grade*sub7credits+sub8grade*sub8credits+sub9grade*sub9credits+sub10grade*sub10credits+sub11grade*sub11credits+sub12grade*sub12credits;
 var expected_cg = weightedcredits/totalcred;
 alert('Your Expected CGPA is ' + expected_cg.toFixed(2));
}