//Functions

function loopFunction(){

var i = 2

while (i < 3 ){

alert ("Please enter valid numbers");

i++

}

}

function promptFunction(){

var a = prompt ("Enter 1st' Number");

var b = prompt ("Enter 2nd' Number");

var c = prompt ("Enter 3rd' Number");

var num1 = parseInt (a);

var num2 = parseInt (b);

var num3 = parseInt (c);

var sum = num1 + num2 + num3;

if ((isNaN (sum)) || (sum === 0)) {

loopFunction ();

promptFunction();

}else{

alert ("The total is: " + sum);

}

}

//Prompt for Numbers

alert ("Enter Three Numbers For Addition");

var a = prompt ("Enter 1st Number");

var b = prompt ("Enter 2nd Number");

var c = prompt ("Enter 3rd Number");

//Sum and Check The Numbers

var num1 = parseInt (a);

var num2 = parseInt (b);

var num3 = parseInt (c);

var sum = num1 + num2 + num3;

// Conditions for Not Entering Numbers

if ((isNaN (sum)) || (sum === 0)) {

loopFunction ();

promptFunction();

}else{

alert ("The total is: " + sum);

}