Answer to Question #260820 in HTML/JavaScript Web Application for pooja

Question #260820

Write a Javascript Program (1 HTML File) that will input an integer value n and display (upon a button click) the following:

1. The nth factorial (Using a While Loop)

2. The sum of the first n numbers (Using a Do While Loop)

3. The Average of the first n numbers (Using a For Loop)

Expert's answer

<html>
 <head>
 <title>Average</title>


 <script language="javascript" type="text/javascript">
    
     window.onload = function () {
         btnCalculate.addEventListener("click", displayResult);
         function displayResult() {
             if (txtN.value == "") {
                 alert("Enter N!!!")
                 return;
             }
             let N=parseInt(txtN.value);
             let factorial=1;
             let i = 1;


             while(i <= N) {
	            factorial = factorial * i;
	            i++;
             }
             let sum=0;
             i=0;
             do{
                sum+=i;
                i++;
             }while(i<=N);
             sum=0;
             for(i=0;i<=N;i++){
                sum+=i;
             }
             let average=sum/N;
             txtFactorial.value=factorial;
             txtSum.value=sum;
             txtAverage.value=average.toFixed(2);
             
         };
     }
    </script> 


 </head>
 <body>
 <form>
 
 <table>
  <tr>
  <tr>
    <td>Enter N</td>
    <td> <input id="txtN" type="text" value=""></td>
  </tr>
   <tr>
    <td>The nth factorial:</td>
    <td> <input id="txtFactorial" type="text" value="" readonly></td>
  </tr>
  <tr>
    <td>The sum of the first n numbers:</td>
    <td> <input id="txtSum" type="text" value="" readonly></td>
  </tr>
  <tr>
    <td>The Average of the first n numbers:</td>
    <td> <input id="txtAverage" type="text" value="" readonly></td>
  </tr>
  <tr>
      <td></td>
    <td> </td>
  </tr>
  <tr>
  <td></td>
    <td><input id="btnCalculate" type="button" value="Calculate"></td>
  </tr>
</table>
 </form>
</html>

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Answer to Question #260820 in HTML/JavaScript Web Application for pooja

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