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JavaScript

Daniel Springer
PLUS
Daniel Springer
Courses Plus Student 5,090 Points

Completed Project: Please comment if you want to. Any suggestions / improvements are welcome!

code

// 1. Attach this file geometry.js to the index.html file

// 2. Create a function that calculates the area of a rectangle.
//    The function should accept the width and height as arguments
//    and return the area of that rectangle.
//    The area of a rectangle is the width * height
var message;
var totalArea;
var totalVolume;
var circleArea;
var sphereVolume;

function area(width, height){

  while(isNaN(width)){
    width = prompt("what is the width of the circle?")
    width = parseFloat(width)

    if(isNaN(width)){  
      alert("The width input is not a number, try again")
    }
  }
  while(isNaN(height)){
    height = prompt("what is the height of the circle?")
    height = parseFloat(height)

    if(isNaN(height)){
       alert("The height input is not a number, try again")
    } 
  }
  return totalArea = width * height
} 
alert("The area of the circle is " + area())
console.log(area)



// 3. Create a function that calculates the volume of a rectangular prism.
//    The function should accept the width, height and length as arguments
//    and return the volume of that rectangular prism.
//    The volume of a rectangular prism is the width * height * length

function volume (width, height, lenght){

  while(isNaN(width)){
  width = prompt("what is the width of the rectangular prism?")
  width = parseFloat(width)

  if (isNaN(width)){
   alert("The width input is not a number, try again")
    }
  }
  while(isNaN(height)){
  height = prompt("what is the height of the rectangular prism?")
  height = parseFloat(height)

  if (isNaN(height)){
   alert("The height input is not a number, try again")
    }
  }
  while(isNaN(lenght)){
  lenght = prompt("what is the lenght of the rectangular prism?")
  lenght = parseFloat(lenght)

  if (isNaN(lenght)){
   alert("The lenght input is not a number, try again")
    }
  }
  return totalVolume = Math.round(width * height * lenght)
}
alert("The volume of the rectangular prism " + volume())
console.log(volume)


// 4. Create a function that calculates the area of a circle.
//    The function should accept the radius of the circle as an argument
//    and return the area of that circle.
//    The area of a circle is the value of Ο€ * radius^2

function circleArea(radius){

  while(isNaN(radius)){
    radius = prompt("What is the radius of your circle?")
    radius = parseFloat(radius)

    if(isNaN(radius)){
      alert("The height input is not a number, try again")
    }
  }
 return circleArea = Math.round(Math.PI * (radius * radius))
}
alert("The area of the circle is " + circleArea())
console.log(circleArea)

// 5. Create a function that calculates the volume of a sphere.
//    The function should accept the radius of the sphere as an argument
//    and return the volume.
//    The volume of a circle is: 4/3 *  Ο€ * radius^3

function sphereVolume(radius){

  while(isNaN(radius)){
    radius = prompt("What is the radius of your sphere?")
    radius = parseFloat(radius)

    if(isNaN(radius)){
      alert("The height input is not a number, try again")
    }
  }
 return sphereVolume = Math.round( 4 / 3 * Math.PI * (radius * radius * radius))
}
alert("The area of the circle is " + sphereVolume())
console.log(sphereVolume)

// 6. Use console.log to test each function and output to the JavaScript console
//    Here are the values to test and the expected results
//    -- Area of rectangle that is 5 wide and 22 tall: 110
//    -- Volume of a rectangular prism that is 4.5 x 12.5 x 17.4: 978.7499999999999
//    -- Area of a circle that with a radius of 7.2: 162.8601631620949
//    -- Volume of a spehere with a radius of 7.2: 1563.4575663561109

message = "<h1>Here are your results:</h1>"
message += "<br>"
message += "<h3>The area of the circle is " + totalArea + "</h3>";
message += "<h3>The volume of the rectangular prism is " + totalVolume + "</h3>";
message += "<h3>The area of the circle is " + circleArea + "</h3>";
message += "<h3>The area of the circle is " + sphereVolume + "</h3>";

document.write(message);

I think you'll get more replies if you link to some working code!