04_Preprocessor Directives and Header File

Preprocessor Directives

• # include  (file)

• # define  (token value) for e.g( #define PI 3.1415 )

• # ifdef     (Test a macro definition)

• # undef  (undefine a macro)

• #ifndef   (Test whether the macro is no def)

• # if       (Test the compile time condition)

• #else   (Specifies alternatives when #if test fails)

• #elif     

• #endif    (Specifies the end of #if)

• #error    

• #pragma

Header Files 

1	stdio.h	Input/Output Functions printf( ), scanf( )
2	conio.h	console input/output clrscr( ), getch( )
3	assert.h	Diagnostics Functions
4	ctype.h	Character Handling Functions
5	cocale.h	Localization Functions
6	math.h	Mathematics Functions abs( ), sqrt( ), floor( ), celi( ), sin( ), cos( ), log( ), log10( ), pow( ), pow10( ), idepx( ), fabs( ), frexp( ), modf( ), acos( ), asin( ), atan( ), atan2( )
7	setjmp.h	Nonlocal Jump Functions
8	signal.h	Signal Handling Functions
9	stdarg.h	Variable Argument List Function
10	stdlib.h	General Utility Functions
11	string.h	String Functions strlen( ), strcat( ), strcpy( ), strcpy( ), strchr( ), strcmp( ), strncat( ), strncmp( )
12	time.h	Date and Time Functions asctime( ), clock( ), ctime( ), difftime( ), getdate( ), gmtime( ), localtime( ), mktime( ), setdate( ), strftime( ), time( )
13	complex.h	A set of function for manipulating complex numbers
14	stdalign.h	For querying and specifying the alignment of objects
15	errno.h	For testing error codes
16	locale.h	Defines localization functions
17	stdatomic.h	For atomic operations on data shared between threads
18	stdnoreturn.h	For specifying  non-returning functions
19	uchar.h	Types and functions for manipulating Unicode characters
20	fenv.h	A set of functions for controlling the floating-point environment
21	wchar.h	Defines wide string handling functions
22	tgmath.h	Type-generic mathematical functions
23	stdarg.h	Accessing a varying number of arguments passed to functions
24	stdbool.h	Defines a boolean data type

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