def square_number(x): return x * x print(square_number(square_number(square_number(2)))) What would this program do if instead the function definition had been: def square_number(x): print(x * x)

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Declaring and Defining the function

A set of statements, which performs a particular task is called a function. The program gains modularity by using function. The application is quite easy to understand, read, and edit when they are created with functions. The developer/programmer creates a function and uses main() to call the function. Once the function gets executed, the control is transferred to the main program.