While writing large programs, main() function will become quite complex to maintain and soon you will lose track of what is happening. This is where functions will aid programmers. Functions allows the programmer to divide a large program into logical chunks. Each function is a self contained block that does a non-trivial task. The main() function will call other functions which in turn solves the problem. This model of programming using functions is known as modular programming or structured programming. Consider the following program which calculates the area and perimeter of a circle using functions. #include<iostream> double area(double);
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How to work with functions in C++
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