Javascript Calculation Using For Loop

Question

I'm sure that this is simple, but the solution is eluding me. I want to write a function that will result in: 1000 + 1001 + 1002 + 1003 + 1004 (so I'll output 5010)

I have a form where the user inputs a number x (1000 in this case) and a number of times it will iterate y (5 in this case)

I know that I need to store the value each time through in var total, but I'm not quite getting it.

I have this so far:

function baleTotal(){
  var x = document.addBale.strt.value;
  var y = document.addBale.baleNum.value;
  var calc = Number(x);
  total = 0;

  for (var y; y > 0; y--) {
   calc++;
  }              

  document.addBale.result.value = total;
}

Right, I had been setting the output value to calc, which gave me 1005 , which is just the iteration. I need to do something like total = total + calc, but I've tried that. — Tony Tambe
– Tony Tambe, Commented Apr 3, 2014 at 23:16

Stephen P · Accepted Answer · 2014-04-03 23:15:19Z

2

You're not actually adding to your total. This does the calculation given the base and the number of iterations and returns the result, rather than operating directly on the DOM.

function baleTotal(base, iterations) {
    var total = 0;
    for (i=0; i<iterations; i++) {
        total += (base + i);
    }
    return total;
}

console.log(baleTotal(1000, 5));

answered Apr 3, 2014 at 23:15

Stephen P

14.9k2 gold badges50 silver badges71 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Octavian · Accepted Answer · 2014-04-03 23:14:09Z

0

You are not doing anything with total and also you are redeclaring y. Try this:

function baleTotal(){
  var x = document.addBale.strt.value;
  var y = document.addBale.baleNum.value;
  var calc = Number(x);
  total = 0;

  for (; y > 0; y--) {
   total += calc + y;
  }              

  document.addBale.result.value = total;
}

Not tested but should work.

answered Apr 3, 2014 at 23:14

Octavian

4,6199 gold badges32 silver badges41 bronze badges

Comments

graemeboy · Accepted Answer · 2014-04-03 23:14:41Z

0

Is this more or less what you mean?

function baleTotal(){
  var x = document.addBale.strt.value;
  var y = document.addBale.baleNum.value;
  total = 0;

  for (var i = 0; i < y; i++) {
   total += x + i;
  }             

  document.addBale.result.value = total;
}

answered Apr 3, 2014 at 23:14

graemeboy

6205 silver badges12 bronze badges

Comments

p.kamps · Accepted Answer · 2014-04-03 23:23:51Z

0

I think this is what you're looking for.

function baleTotal(){
  total = 0;
  for (var i = 0; i < document.addBale.baleNum.value; ++i) {
    total += document.addBale.strt.value + i;
  }
  document.addBale.result.value = total;
}

answered Apr 3, 2014 at 23:23

p.kamps

864 bronze badges

Collectives™ on Stack Overflow

Javascript Calculation Using For Loop

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related