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5.	What is a function?
	A Function is a set of instructions used to perform a specified task which repeatedly occurs in the main program.
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6.	What is the difference between declaration and definition of a function?
	Like variables, declaration of a function only identifies the return type of the function and the type of format arguments. The declaration of a function is usually referred as a function prototype. On the other hand, definition of a function contains the statements to accomplish the intended task. Like variables functions also have an address associated with its name.
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7.	What is gets() function?
	The gets() function allows a full line data entry from the user. When the user processes the enter key to end the input, the entire line of characters is stored to a string variable.
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8.	What are static functions?
	In C, functions are global by default. The static keyword before a function name makes it static. Unlike global functions in C, access to static functions is restricted to the file where they are declared. Therefore, when we want to restrict access to functions, we make them static. Another reason for making functions static can be reuse of the same function name in other files.
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