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1.	Which year C language is developed?
	C programming languages was developed at Bell Laboratories in 1972 by Dennis Ritchie.
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2.	What is C language?
	C language is a structure/procedure oriented, middle level programming language developed at Bell Laboratories in 1972 by Dennis Ritchie. C language was invented for implementing UNIX operating system. In 1978, Dennis Ritchie and Brian Kernighan published the first edition "The C Programming Language". Also, C language is an ANSI/ISO standard and powerful programming language for developing real time applications.
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3.	What is pragma in C?
	#pragma is a pre processor macro in C. It is used to call a function before and after main function in a C program.
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4.	What is header file in C language?
	Header file is a file that contains functions declaration and macro definition for C in built library functions. All C standard library functions are declared in many header files which are saved as file_name.h. We are including these header files in our C program using "#include" command to make use of the functions those are declared in the header files. When we include header files in our C program using "#include" command, all c code of the header files are included in C program. Then, this C program is compiled by compiler and executed.
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