C Standard Library Functions- Character classification Functions

Character classification Functions

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Function           Use

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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

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C Standard Library Functions- Data Conversion Functions

 Data Conversion Functions

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Function           Use

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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

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C Standard Library Functions- Arithmetic Functions

Arithmetic Functions

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Function      Use

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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