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List of C Header File with Detailed Explanations
This Chapter is intended to clear your fundamental concepts with the help of numerous programming problems. The programs are mapped out in such a way that with each step you will move towards perfectionism. It’s highly recommended to do every program with the pen and paper for enhancing your programming concepts efficiently.
Standard Library Functions - Header File
In the C Programming Language, the Standard Library Functions are divided into several header files.
Below is the list of header files that we will cover:
Header Files
<assert.h> Diagnostics Functions
<ctype.h> Character Handling Functions
<locale.h> Localization Functions
<math.h> Mathematics Functions
<setjmp.h> Nonlocal Jump Functions
<signal.h> Signal Handling Functions
<stdarg.h> Variable Argument List Functions
<stdio.h> Input/Output Functions
<stdlib.h> General Utility Functions
<string.h> String Functions
<time.h> Date and Time Functions
Standard Library Functions - ctype.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <ctype.h> header file:
Character Testing functions
isalnum Test for Alphanumeric
isalpha Test for Alphabetic
iscntrl Test for Control Character
isdigit Test for Digit
isgraph Test for Graphical Character (does not include a space).
islower Test for Lowercase Letter
isprint Test for Printing Character (does include a space).
ispunct Test for Punctuation Character
isspace Test for White-Space Character
isupper Test for Uppercase Letter
isxdigit Test for Hexadecimal Digit
Character Case-Mapping functions
Tolower Convert to Lowercase
Toupper Convert to Uppercase
Standard Library Functions - locale.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <locale.h> header file:
Localization functions
localeconv Get Locale Conventions
setlocale Set Locale
Standard Library Functions - math.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <math.h> header file:
Absolute Value functions
Fabs Absolute Value of Floating-Point Number
Nearest Integer, Absolute Value, and Remainder functions
ceil Ceiling
floor Floor
fmod Floating Modulus
Exponential and Logarithmic functions
exp Exponential
frexp Split into Fraction and Exponent
ldexp Combine Fraction and Exponent
log Natural Logarithm
log10 Common Logarithm
modf Split into Integer and Fractional Parts
Power functions
pow Power
sqrt Square Root
Trigonometric functions
acos Arc Cosine
asin Arc Sine
atan Arc Tangent
atan2 Arc Tangent of Quotient
cos Cosine
sin Sine
Hyperbolic functions
cosh Hyperbolic Cosine
sinh Hyperbolic Sine
tanh Hyperbolic Tangent
Standard Library Functions - setjmp.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <setjmp.h> header file:
Nonlocal Jump functions
longjmp Nonlocal Jump
setjmp Prepare for Nonlocal Jump
Standard Library Functions - signal.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <signal.h> header file:
Signal Handling functions
raise Raise Signal
signal Install Signal Handler
Standard Library Functions - stdarg.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <stdarg.h> header file:
Variable Argument List functions
va_arg Fetch Argument from Variable Argument List
va_end End Processing of Variable Argument List
va_start Start Processing of Variable Argument List
Standard Library Functions - stdio.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <stdio.h> header file:
Formatted Input/Output functions
fprintf Formatted File Write
fscanf Formatted File Read
printf Formatted Write
scanf Formatted Read
sprintf Formatted String Write
sscanf Formatted String Read
vfprintf Formatted File Write Using Variable Argument List
vprintf Formatted Write Using Variable Argument List
vsprintf Formatted String Write Using Variable Argument List
File Operation functions
fclose Close File
fflush Flush File Buffer
fopen Open File
freopen Reopen File
remove Remove File
rename Rename File
setbuf Set Buffer (obsolete)
setvbuf Set Buffer
tmpfile Create Temporary File
tmpnam Generate Temporary File Name
Character Input/Output functions
fgetc Read Character from File
fgets Read String from File
fputc Write Character to File
fputs Write String to File
getc Read Characters from File
getchar Read Character
gets Read String
putc Write Character to File
putchar Write Character
puts Write String
ungetc Unread Character
Block Input/Output functions
fread Read Block from File
fwrite Write Block to File
File Positioning functions
fgetpos Get File Position
fseek File Seek
fsetpos Set File Position
ftell Determine File Position
rewind Rewind File
Error Handling functions
clearer Clear Stream Error
feof Test for End-of-File
ferror Test for File Error
perror Print Error Message
Standard Library Functions - stdlib.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <stdlib.h> header file:
Communication with the Environment functions
abort Abort Program
atexit Register Function to be Called at Program Exit
exit Exit from Program
getenv Get Environment String
system Perform Operating System Command
Integer Arithmetic functions
abs Absolute Value of Integer
div Integer Division
labs Absolute Value of Long Integer
ldiv Long Integer Division
Pseudo-Random Sequence Generation functions
rand Generate Pseudo-Random Number
srand Seed Pseudo-Random Number Generator
String Conversion functions
atof Convert String to Floating-Point
atoi Convert String to Integer
atol Convert String to Long Integer
strtod Convert String to Double
strtol Convert String to Long Integer
strtoll Convert String to Long Long
strtoul Convert String to Unsigned Long Integer
Searching and Sorting functions
bsearch Binary Search
qsort Sort Array
Dynamically Allocated Array functions
calloc Allocate and Clear Memory Block
malloc Allocate Memory Block
realloc Resize Memory Block
Deallocating Storage functions
free Free Memory Block
Multibyte Character functions
mblen Compute Length of Multibyte Character
mbtowc Convert Multibyte Character to Wide Character
wctomb Convert Wide Character to Multibyte Character
Multibyte String functions
mbstowcs Convert Multibyte String to Wide Character String
wcstombs Convert Wide Character String to Multibyte String
Standard Library Functions - string.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <string.h> header file:
Comparison functions
memcmp Compare Memory Blocks
strcmp String Compare
strcoll String Compare Using Locale-Specific Collating Sequence
strncmp Bounded String Compare
strxfrm Transform Locale-Specific String
Concatenation functions
strcat String Concatenation
strncat Bounded String Concatenation
Copying functions
memcpy Copy Memory Block
memmove Copy Memory Block
strcpy String Copy
strncpy Bounded String Copy
Search functions
memchr Search Memory Block for Character
strchr Search String for Character
strcspn Search String for Intial Span of Characters Not in Set
strpbrk Search String for One of a Set of Characters
strrchr Search String in Reverse for Character
strspn Search String for Initial Span of Characters in Set
strstr Search String for Substring
strtok Search String for Token
Miscellaneous functions
memset Initialize Memory Block
strerror Convert Error Number to String
strlen String Length
Standard Library Functions - time.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <time.h> header file:
Time Conversion functions
asctime Convert Date and Time to ASCII
ctime Convert Date and Time to String
gmtime Convert to Greenwich Mean Time
localtime Convert to Local Time
mktime Convert to Calendar Time
strftime Write Formatted Date and Time to String
Time Manipulation functions
clock Processor Clock
difftime Time Difference
time Current Time
Copying functions
memcpy Copy Memory Block
memmove Copy Memory Block
strcpy String Copy
strncpy Bounded String Copy
List of inbuilt C functions in conio.h file:
clrscr() This function is used to clear the output screen.
getch() It reads character from keyboard
getche() It reads character from keyboard and echoes to o/p screen
textcolor() This function is used to change the text color
textbackground() This function is used to change text background