The factorial function does not involve multiplication

Question

The factorial function does not involve multiplication

Every time I execute the code, it doesn't actually perform the multiplication of my number. Instead, it continues to output in a loop until it reaches 1.

I've attempted various methods and this one is the most promising so far.

    ......................................
    var BR="<br />"; //html line break

    function factorial(Num) {

   document.write("The factorial of your number is" +Num +BR);

   if (Num == 1 ) return 1;

   else return (Num * factorial(Num-1));

    }
.....................................................        





   .......................................
        var Num; //users number
        var Numfactorial;
        var ES="";
               var factorial                     
        Num=prompt("Enter a number between 1-20" +ES);
        Numfactorial=factorial(Num);
     .........................................

The intended functionality is to take the input number and recursively multiply it down - for example, entering 20 should result in: 20*19*18... continuing until it reaches 1 and then outputs the final product.

javascript

Answer 1

Answer №1

Move the document.write statement outside of the function and simply display the result (Numfactorial) on the page. Remember to convert Num into a number by using parseInt, and eliminate the need for var factorial:

var BR = "<br />";
function factorial(Num) {
    if (Num == 1) return 1;
    else return Num * factorial(Num - 1);
}
var Num;
var Numfactorial;
var ES = "";
Num = parseInt(prompt("Please input a number between 1-20" + ES));
Numfactorial = factorial(Num);
document.write("The factorial of the given number is " + Numfactorial + BR);

Answer 2

Move the document.write statement outside of the function and simply display the result (Numfactorial) on the page. Remember to convert Num into a number by using parseInt, and eliminate the need for var factorial:

var BR = "<br />";
function factorial(Num) {
    if (Num == 1) return 1;
    else return Num * factorial(Num - 1);
}
var Num;
var Numfactorial;
var ES = "";
Num = parseInt(prompt("Please input a number between 1-20" + ES));
Numfactorial = factorial(Num);
document.write("The factorial of the given number is " + Numfactorial + BR);

Answer 3

Answer №2

The code you have written is producing the expected output. However, there is a small modification that can be made to improve it. Instead of just returning the factorial value from your function, you should also display it in the output. Here is how you can do this:

....................................................
var BR="<br />"; //html line break
function factorial(Num) {
   if (Num == 1 ) return 1;
   else return (Num * factorial(Num-1));
}
.....................................................



.......................................
    var Num; //users number
    var Numfactorial;
    var ES="";
           var factorial                     
    Num=prompt("Enter a number between 1-20" +ES);
    Numfactorial=factorial(Num);
    document.write("The factorial of your number is" +Numfactorial +BR);
 .........................................

Answer 4

The code you have written is producing the expected output. However, there is a small modification that can be made to improve it. Instead of just returning the factorial value from your function, you should also display it in the output. Here is how you can do this:

....................................................
var BR="<br />"; //html line break
function factorial(Num) {
   if (Num == 1 ) return 1;
   else return (Num * factorial(Num-1));
}
.....................................................



.......................................
    var Num; //users number
    var Numfactorial;
    var ES="";
           var factorial                     
    Num=prompt("Enter a number between 1-20" +ES);
    Numfactorial=factorial(Num);
    document.write("The factorial of your number is" +Numfactorial +BR);
 .........................................

The factorial function does not involve multiplication

Answer №1

Answer №2

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