JavaScript error with do while loop

Question

Trying to create a script that asks a user for a range of positive inputs and ends when a negative input is introduced. Then prints the sum and average of the inputs in an alert. Any idea why I'm getting an error on my if statement?

var value;
var sum = 0;
var HTMLout;
var i = 0;

do {

    if(isNaN(value) {
        alert("Enter a positive integer");
    } else {
        value = parseInt(prompt("Enter a positive integer", "Enter a negative integer to quit"));
        sum += value;
        i++;
    }

} while(value != -1);

HTMLout += alert("The sum of these numbers is " + sum);
HTMLout += alert("The average of these numbers is " + sum/i);

What kind of an error? Please include that info, too, it will help with identifying the problem, thanks! — plamut
– plamut, Commented Feb 2, 2016 at 10:44

Leistungsabfall · Accepted Answer · 2016-02-02 10:42:53Z

2

You forgot a closing bracket:

if(isNaN(value)

should be

if(isNaN(value))

answered Feb 2, 2016 at 10:42

Leistungsabfall

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Comments

AdityaParab · Accepted Answer · 2016-02-02 10:43:27Z

2

Syntax Error.

Change if(isNaN(value) to if(isNaN(value))

------------------------------------------------------------^ Missing Parenthesis

answered Feb 2, 2016 at 10:43

AdityaParab

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Comments

anand · Accepted Answer · 2016-02-02 10:49:26Z

0

It is a syntax error
You forgot to place the ending parenthesis. Change if statement to the below code

if(isNaN(value))
{
    alert("Enter a positive integer");
}

answered Feb 2, 2016 at 10:49

anand

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