How to check for a decimal point

I am creating a maths game with Javascript by randomly generating two numbers between 1 and 12 and carrying out some mathematics on the two (randomly putting one of: +,-,*,/). Divide proves a problem as obvously two numbers divided can result in awkward answers, recurring 3's for example. Does anyone know how I can check for a decimal point in an answer and if so generate a new equation?

Many thanks,

Chris

 

use regular expression, e.g.

/\./

 

You can use the % operator.
if you have 2 values a and b, a%b gives you the remainder, like 4%3 = 1.
So in your case, that would be something like:

if(a%b==0){
  // do something
}else{
  // generate new equation
}

Code (markup):