Write a program to take the input for radius of a circle and display the area of a circle only when the radius is positive. Program should print "End of program" before ending the program irrespective of the value of radius.   This is for devc++

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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.