JavaScript program to calculate rectangle area and circumference

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Following program shows you how to calculate rectangle area and circumference.
This program gets rectangle length and width from user and calculates area and circumference and prints them using following formulas
Area = length X width
Circumference = 2 X length + 2 X width

var rectangleLength = parseInt(prompt("Enter length of rectangle:"));
var rectangleWidth = parseInt(prompt("Enter width of rectangle:"));
var areaOfRectangle = rectangleLength * rectangleWidth ;
console.log("Area of rectangle is: " + areaOfRectangle);
var circumferenceOfRectangle = 2 * (rectangleLength) + 2 * (rectangleWidth);
console.log("Circumference of rectangle is: " + circumferenceOfRectangle);

Output:

Enter length of rectangle:
50
Enter width of rectangle:
60
Area of rectangle is: 3000.0
Circumference of rectangle is: 220.0
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