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User Enters Amount On Numbers Then Output The Highest Number Javascript

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i have to write a program which asks the user in advance how many numbers will be input. Receive that many numbers and output the highest using JavaScript functions. Having a set a

Solution 1:

Just change the hardcoded 20 to numbers; I ran it and it worked for me... after adding a text field for result

var arr = []; 
for (var i = 0; i < numbers; i++) {
    arr[i] = parseInt(prompt('Enter a number'), 0);
}

then i added a label

<label id='result' />

then fixed your assignment to :

document.getElementById('result').innerHTML = maxNum;

FULL DOCUMENT:

<!DOCTYPE html>
<html>
<head> <meta charset="utf-8" />
<title></title>

<script style="text/javascript">
    function numbers(){
    var numbers = 0;
    var outMessage = "";
    var numbersArray = new Array(numbers);

    do{
        numbers = prompt('How many numbers?', 0);
    }while(isNaN(numbers));


    var arr = []; 
    for (var i = 0; i < numbers; i++) {
      arr[i] = parseInt(prompt('Enter a number'), 10);
    }

    var maxNum = Math.max.apply(null, arr);
    alert(maxNum);
    document.getElementById('result').innerHTML = maxNum;
    // or you can use numbers instead of result.. because of your p tag with 
    // the id of numbers
    }
</script>
<body>
<p>Numbers Exercise</p>
<p id="numbers"></p>
<input type="button" value="Start" onClick = "numbers();">
<!-- here -->
<label id='result' />
</body>
</html>

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