Area of the circle

Question

So I created a .js file to calculate the area of a circle and calculateArea() needs to calculate it. The only thing that it does is the prompt(). What am I doing wrong?

function calculateArea(myRadius){
  var area = (myRadius * myRadius * Math.PI);
  return area;

  function MyArea(){
    calculateArea(myRadius);
    alert("A circle with a " + myRadius + 
          "centimeter radius has an area of " + area + 
          "centimeters. <br>" + myRadius + 
          "represents the number entered by the user <br>" + area +
          "represents circle area based on the user input.");  
  }      
}
var myRadius = parseFloat(prompt("Enter the radius of your circle in cm:",0));
calculateArea(myRadius);

Answer 1

You need to keep function MyArea outside calculateArea and call calculateArea from within MyArea.

Call MyArea function instead of calculateArea.

Example Snippet:

function calculateArea(myRadius) {
  return (myRadius * myRadius * Math.PI);
}

function MyArea() {
  var area = calculateArea(myRadius);
  alert("A circle with a " + myRadius + "centimeter radius has an area of " + area + "centimeters. <br>" + myRadius + "represents the number entered by the user <br>" + area + "represents circle area based on the user input.");


}

var myRadius = parseFloat(prompt("Enter the radius of your circle in cm:", 0));
MyArea(myRadius);

PS: There are better ways to do this. Comment in case of questions.