Header Files

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stdio.h: Standard input and output files. All formatted and un-formatted functions include file operation functions defined in this file. The most useful formatted printf() and scanf()are defined in this file. This file must be included at the top of the program. Most useful functions from this header file are printf(), scanf(), getchar(), gets(), putc(), and putchar().
           
  conio.h : Console inout and output. This file contains input and output functions along with a few graphic-supporting functions. This getch(), geche(), and clrscr()functions are defined in this file.
   
    math.h : This file contains all mathematical and other useful functions. The commonly useful functions this file are floor(), abs(), ceil(), pow(), sin(), cos() and tan(). The list of commonly used header files are given table:-

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String Comparisons

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