What is Standard Header Files ?

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Prototypes of the library functions are given in several standard header files. For example, stdio.h contains prototypes for printf, scanf, putchar and getchar . Other standard header files are:

assert.h assertions
ctype.h character class tests
float.h system limits for floating point types
limits.h system limits for integral types
math.h mathematical functions
setjmp.h non-local jumps
signal.h signals and error handlingstdarg.h variable length parameter lists
stdlib.h utility functions; number conversions, memory allocation, exit and system , Quick Sort
string.h string functions
time.h date and time functions

To include these standard header files in your code, use the preprocessor directive #include and place angle brackets around the name of the file, e.g.


#include<math.h>

What is Standard Header Files ?

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