javascript - why is this while loop causing an infinite loop? -


for reason i'm having difficulty getting while loop work. keeps crashing browser whenever try test out, , in 1 case able see results of loop in console, saw nan printed several times. there i've forgotten in code?

<div id="output"></div>  <script>  var starting = prompt("what starting balance?"); var target = prompt("what target balance?"); var interest = prompt("what interest rate?"); var periods = 0;  var current = starting; var greaterthan = false;  while (greaterthan === false) {   if (current < target) {     current = current + (current * interest);     periods++;   } else {     greaterthan = true;     alert("it took " + periods + " periods make starting balance greater target balance.");     document.queryselector('#output').textcontent = "to grow initial investment of " + starting + " " + target + " @ " + interest + " interest rate require " + periods + " investment periods.";   } }  </script>

you forgetting convert result prompt string number.

var starting = parsefloat(prompt("what starting balance?"));

do same thing other numbers input user prompt.


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