C Tutorials

Basics in C

Introduction of C
Keywords in C
Data Types in C
First Program in C
Add Two Numbers in C
Input from User in C
String Input from User in C

Decision Making

If Statement in C
If and Else Statement in C
AND Operator in If Statement in C
Switch Statement in C

Loops

While Loop in C
While Loop User Input in C
Triangle using While Loop in C
For Loop in C
For Loop using Continue in C
Do While Loop in C
Triangle using Do While Loop in C

Functions

Function in C
Calling Function inside Function in C
Passing Arguments to Function in C
Passing String Arguments to Function in C
Passing Arguments to Function and Return in C
Calling Function of .h File in C

Arrays

Array in C
String Array in C
User Input in Array in C
Find Min and Max Number in Array in C
Two Dimensional Array in C
User Input using Gets and Puts in C

Pointers

Pointers in C
Working with Pointers in C
String Functions in C

Structure

Structure in C
Passing Arguments in Structure in C
Passing Arguments and Return in Structure in C
Constructor in Structure in C

Data and Time

Date and Time in C

File Handling

Read and Write Text File in C
Deleting File in C
Create and Delete Directory in C
File Opening Modes in C

More Examples

Encryption and Decryption in C
Open Application in C
Defining Startup and Exit in C
Working with Define in C
View Address of Variable in C
Shut Down Computer in C

Library Functions

Precedence Table in C
Arithmetic Functions in C
IO Functions in C
Disk IO Functions in C
Basic Data Types Meanings in C
Printf Format Specifiers in C
Library Header Files in C

Arithmetic Functions in C

Arithmetic, conversion, classification, manipulation, searching, and sorting functions in C programming with descriptions are listed below. You can use the following functions to work with values.

Arithmetic Functions

Function	Use
abs	Returns the absolute value of an integer.
cos	Calculates cosine.
cosh	Calculates hyperbolic cosine.
exp	Raises the exponential e to the xth power.
fabs	Finds absolute value.
floor	Finds largest integer less than or equal to argument.
fmod	Finds floating-point remainder.
hypot	Calculates hypotenuse of right triangle.
log	Calculates natural logarithm.
log10	Calculates base 10 logarithm.
modf	Breaks down argument into integer and fractional parts.
pow	Calculates a value raised to a power.
sin	Calculates sine.
sinh	Calculates hyperbolic sine.
sqrt	Finds square root.
tan	Calculates tangent.
tanh	Calculates hyperbolic tangent.

Data Conversion Functions

Function	Use
atof	Converts string to float.
atoi	Converts string to int.
atol	Converts string to long.
ecvt	Converts double to string.
fcvt	Converts double to string.
gcvt	Converts double to string.
itoa	Converts int to string.
ltoa	Converts long to string.
strtod	Converts string to double.
strtol	Converts string to long integer.
strtoul	Converts string to an unsigned long integer.
ultoa	Converts unsigned long to string.

Character Classification Functions

Function	Use
isalnum	Tests for alphanumeric character.
isalpha	Tests for alphabetic character.
isdigit	Tests for decimal digit.
islower	Tests for lowercase character.
isspace	Tests for white space character.
isupper	Tests for uppercase character.
isxdigit	Tests for hexadecimal digit.
tolower	Tests character and converts to lowercase if uppercase.
toupper	Tests character and converts to uppercase if lowercase.

String Manipulation Functions

Function	Use
strcat	Appends one string to another.
strchr	Finds first occurrence of a given character in a string.
strcmp	Compares two strings.
strcmpi	Compares two strings without regard to case.
strcpy	Copies one string to another.
strdup	Duplicates a string.
stricmp	Compares two strings without regard to case (identical to strcmpi).
strlen	Finds length of a string.
strlwr	Converts a string to lowercase.
strncat	Appends a portion of one string to another.
strncmp	Compares a portion of one string with portion of another string.
strncpy	Copies a given number of characters of one string to another.
strnicmp	Compares a portion of one string with a portion of another without regard to case.
strrchr	Finds last occurrence of a given character in a string.
strrev	Reverses a string.
strset	Sets all characters in a string to a given character.
strstr	Finds first occurrence of a given string in another string.
strupr	Converts a string to uppercase.

Searching and Sorting Functions

Function	Use
bsearch	Performs binary search.
lfind	Performs linear search for a given value.
qsort	Performs quick sort.

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