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21.	What is FIFO?
	In C programming, there is a data structure known as queue. In this structure, data is stored and accessed using FIFO format, or First In First Out. A queue represents a line wherein the first data that was stored will be the first one that is accessible as well.
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22.	What is the difference between pre decrement and post decrement operator?
	Pre decrement operator is used to decrement variable value by 1 before assigning the value to the variable. Post decrement operator is used to decrement variable value by 1 after assigning the value to the variable.
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23.	Is it possible to write a program without a main() functions?
	No, the main functions is mandatory. The execution of all programs begins from the main() function.
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24.	What is file pointer in C?
	File pointer is a pointer which is used to handle and keep track on the files being accessed. A new data type called FILE is used to declare file pointer. This data type is defined in stdio.h file. File pointer is declared as FILE *fp. Where, 'fb' is a file pointer. fopen() function is used to open a file that returns a FILE pointer. Once file is opened, file pointer can be used to perform I/O operations on the file. fclose() function is used to close the file.
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