Write and test a program that computes the area of a circle. Request a number representing a radius as input from the user. Use the formula 3.14 × radius2 to compute the area. Output this result with a suitable label. An example of the program input and output is shown below: Enter the radius: 5 The area is 78.5 square units.

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.