What are header files and what are its uses in C programming?

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Header files are also known as library files. They contain two essential things: the definitions and prototypes of functions being used in a program. Simply put, commands that you use in C programming are actually functions that are defined from within each header files. Each header file contains a set of functions. For example: stdio.h is a header file that contains definition and prototypes of commands like printf and scanf.

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432. What are variables and it what way is it different from constants?

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433. How do you access the values within an array?

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436. Why is it that not all header files are declared in every C program?

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437. When is the "void" keyword used in a function?

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438. What are compound statements?

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