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Standard header files in C programming language-Important topics in C-computer science/Information technology

Standard header files in C
programming language

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Header files are the files that contain the set of predefined library functions that can be used anywhere while writing the program. That's why they become handy in use for their operations while writing a C program.



The following header files are the standard ones:

1.stdio.h
               This header file is used for various input/output functions like printf(),scanf(),etc.
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2.stdlib.h
               This header file is mainly used for dynamic memory allocation like malloc(),calloc(),realloc(),free() and even for some functions like abs() [for absolute value of the number] and atoi()[ for converting string to a number] and even more.
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3.conio.h
               This header file is used for characters like when implementing putch(),putchar(),getch(),getchar(),etc.
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4.string.h
               This header file is used for implementing the string functions like gets(),puts(),strlen()[ for finding the length of the string] and even more string related functions.
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5.ctype.h
               This header file is basically used when knowing the type of the argument used like islower(),isupper(),isdigit(),isalpha() and even more.
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6.math.h
              This header file is used for implementing the math functions like pow(2,3)[2^3=8] and even more.
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7.limits.h
             This header file is used for implementing the limits on the number range like USHRT_MIN,SHRT_MAX and even more.
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8.graphics.h
             This header file is used for implementing the functions of graphics like initgraph(),closegraph(),etc.
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9.time.h
             This header file is basically for implementing the date and timing functions in C like time(),clock(),etc.
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10.float.h
             This header file is used for implementing limits on float data types like FLT_RADIX[ Minimum value is 2],etc.

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