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Asked: 2026-06-06T09:00:18+00:00

Possible Duplicate: Evaluating a string as a mathematical expression in javascript I have written

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Possible Duplicate:
Evaluating a string as a mathematical expression in javascript

I have written a snippet of code in javascript, for a prompt to appear when clicked. I want to be able to enter a simple math problem (i.e. 230/2) and have it output the answer, rather than the math problem I just entered. Your help will be much appreciated.

<!DOCTYPE html>
<html>
<body>


<button onclick="myFunction()">Click me</button>

<p id="demo"></p>

<script type="text/javascript">
function myFunction()
{
var x;

var mathProblem=prompt("Enter your math problem","");

if (name!=null)
  {
  x = mathProblem;
  document.getElementById("demo").innerHTML = x;
  }
}
</script>

</body>
</html>
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1 Answer

  1. Editorial Team

    You can use eval() to compute it:

    document.getElementById("demo").innerHTML = eval(x);

    Here is how your code should be:

    function myFunction()
{
  var mathProblem = prompt("Enter your math problem","");

  if (mathProblem)
  {
    document.getElementById("demo").innerHTML = eval(mathProblem);
  }
}

    Or if you dont want to use eval() (not recommended usually), you can create small functions to do the computation like for adding, dividing, etc

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