What is Standard Header Files ?

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:

1. assert.h assertions
2. ctype.h character class tests
3. float.h system limits for floating point types
4. limits.h system limits for integral types
5. math.h mathematical functions
6. setjmp.h non-local jumps
7. signal.h signals and error handlingstdarg.h variable length parameter lists
8. stdlib.h utility functions; number conversions, memory allocation, exit and system , Quick Sort
9. string.h string functions
10. 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>