[SOLVED] Why are these not adding?

[ballhogjoni]

num = 2 and TOTAL_ADULTS = 1

 

alert(num + TOTAL_ADULTS);

 

When I alert this it gives me 21. It should give me 3.

[rhodesa]

In javascript, both addition and concatenation use the + symbol. So, if one of the variables is a string (even if it's all numbers in that string) it will use concatenation. Either fine which one is a string, and fix the code earlier to make it an integer...or just wrap the values in parseInt():

 

<script type="text/javascript">
  var num = 2;
  var TOTAL_ADULTS = '1';
  alert(parseInt(num) + parseInt(TOTAL_ADULTS));
</script>