Why do I get NaN from I function in JavaScript -

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i have simple javascript program converts celsius fahreinheit , vice versa. 1 function not work , returns nan.

<script type="text/javascript">     function ctof() {         c = parseint(document.getelementbyid("celsiustemp").value);         fah = c * (9 / 5) + 32;         document.getelementbyid("resc").innerhtml = fah;     }      function ftoc() {         f = parseint(document.getelementbyid("celsiustemp").value);         cel = (f - 32) * (5 / 2);         document.getelementbyid("resf").innerhtml = cel;     } </script> <body>     <form>         <p>insert celsius temperatur:             <input type="text" id="celsiustemp" />             <br>         </p>         <p>insert fahrenheit temperatur:             <input type="text" id="fahreheittemp" />             <br>         </p>         <input type="button" class="btn btn-success" onclick="ctof()" value="calc fahrenheit" />         <input type="button" class="btn btn-warning" onclick="ftoc()" value="calc celsius" />     </form>     <br/>     <p>the result :         <br/>         <p>result celsius fahreinhet:</p><span id="resc"></span>          <p>result fahreinhet celsius:</p><span id="resf"></span>  </body>

why nan when calculating celsius)

thanks!!

you need replace:

f = parseint(document.getelementbyid("celsiustemp").value);

with:

f = parseint(document.getelementbyid("fahreheittemp").value);

if click calc celsius button, try value celsius field. if that's empty, parseint return nan:

isnan(parseint("")) === true

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