Calculating the mean value of the numbers provided in the input

Question

Calculating the mean value of the numbers provided in the input

I'm struggling with calculating the average of numbers entered through a prompt window. I want to display the numbers as I've done so far, but combining them to find the average is proving difficult.

Here's the code I have:

<html>
<body>

<script type="text/javascript">
function show_prompt() {
    i = 0;
    do {
        var number = prompt("Please Enter a Number");
        var number = parseInt(number);
        i++;

        document.write("Number: " + number);
        document.write("<br>");
        
    }
    while (i < 5);
}
show_prompt();
var avrg = number + number + number + number + number
document.write('Average of scores : ' + avrg);     
</script>   
</body>
</html>

javascript loops average

Answer 1

Answer №1

Make sure to move the calculation inside the function for a more efficient approach. Here's a simpler way of achieving the same result:

function show_prompt() {
  var i = 0;
  var sum = 0; // variable to store the sum of numbers
  do {
    var number = prompt("Please Enter a Number");
    sum += parseInt(number); // add the entered number to sum
    i++;

    document.write("Number: " + number);
    document.write("<br>");

  }
  while (i < 5);

  document.write('Average of scores : ' + sum / i);
}
show_prompt();

Here are some comments on your previous code with mistakes:

function show_prompt() {
    i = 0;
    do {
        // no need to declare number twice
        // also you're not summing up the entered numbers anywhere
        var number = prompt("Please Enter a Number");
        var number = parseInt(number);
        i++;

        document.write("Number: " + number);
        document.write("<br>");

    }
    while (i < 5);
}
show_prompt();
// number is out of scope of function show_prompt, hence undefined
var avrg = number + number + number + number + number
// to get an average, divide the sum by the total count of numbers
document.write('Average of scores : ' + avrg);

Answer 2

Make sure to move the calculation inside the function for a more efficient approach. Here's a simpler way of achieving the same result:

function show_prompt() {
  var i = 0;
  var sum = 0; // variable to store the sum of numbers
  do {
    var number = prompt("Please Enter a Number");
    sum += parseInt(number); // add the entered number to sum
    i++;

    document.write("Number: " + number);
    document.write("<br>");

  }
  while (i < 5);

  document.write('Average of scores : ' + sum / i);
}
show_prompt();

Here are some comments on your previous code with mistakes:

function show_prompt() {
    i = 0;
    do {
        // no need to declare number twice
        // also you're not summing up the entered numbers anywhere
        var number = prompt("Please Enter a Number");
        var number = parseInt(number);
        i++;

        document.write("Number: " + number);
        document.write("<br>");

    }
    while (i < 5);
}
show_prompt();
// number is out of scope of function show_prompt, hence undefined
var avrg = number + number + number + number + number
// to get an average, divide the sum by the total count of numbers
document.write('Average of scores : ' + avrg);

Answer 3

Answer №2

Take note that the variable "number" is only accessible within the `show_prompt()` function and cannot be accessed outside of it.

To calculate the average, you should modify your `show_prompt` function so that it doesn't loop but rather returns the number. Additionally, create another function that calls `show_prompt` multiple times and calculates the average based on the returned values. Currently, your code calculates the sum, not the average.

I won't provide the exact code, but here's a general idea:

calculate_average:
  var sum = 0;
  repeat 5 times:
    sum = sum + show_prompt();
  average = sum / 5;

show_prompt:
  var number = prompt('Enter a number');
  return number

Answer 4

Take note that the variable "number" is only accessible within the `show_prompt()` function and cannot be accessed outside of it.

To calculate the average, you should modify your `show_prompt` function so that it doesn't loop but rather returns the number. Additionally, create another function that calls `show_prompt` multiple times and calculates the average based on the returned values. Currently, your code calculates the sum, not the average.

I won't provide the exact code, but here's a general idea:

calculate_average:
  var sum = 0;
  repeat 5 times:
    sum = sum + show_prompt();
  average = sum / 5;

show_prompt:
  var number = prompt('Enter a number');
  return number

Calculating the mean value of the numbers provided in the input

Answer №1

Answer №2

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