Searching and Sorting Functions in C programming

Searching and Sorting Functions
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Function                           Use
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bsearch                            Performs binary search
lfind                                 Performs linear search for a given value
qsort                                Performs quick sort
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String Manipulation Functions in C programming

String Manipulation Functions

Function	Use
strchr	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

Character classification Functions in C programming

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

Data Conversion Functions in C programming

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

Arithmetic Functions in C programming

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 tangen