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Standard Library

string.h

strcmp()

Compare Two Strings

strlen()

Get String Length

strcpy()

Copy String Content

strcat()

Concatenate Strings

ctype.h

isalpha()

Check if Alphabetical Character

isspace()

Check for Whitespace Character

islower()

Check if Lowercase Character

isprint()

Check Printable Character

isgraph()

Test for Printable Character

isupper()

Check Upper Case Character

isalnum()

Check if Alphanumeric Character

iscntrl()

Check Control Character

isdigit()

Check if Digit Character

tolower()

Convert to Lowercase

isxdigit()

Check for Hexadecimal Digit

ispunct()

Check if Punctuation Character

toupper()

Convert to Upper Case

math.h

log()

Calculate Natural Logarithm

floor()

Round Down to Integer

exp()

Calculate Exponential Function

ceil()

Round Up to Integer

acosh()

Inverse Hyperbolic Cosine

atan()

Arc Tangent Calculation

sqrt()

Calculate Square Root

tanh()

Hyperbolic Tangent Calculation

tan()

Calculate Tangent

log10()

Calculate Base-10 Logarithm

asinh()

Calculate Hyperbolic Arcsine

pow()

Exponentiation Function

sin()

Calculate Sine

cos()

Calculate Cosine

cosh()

Calculate Hyperbolic Cosine

acos()

Calculate Arc Cosine

cbrt()

Compute Cube Root

asin()

Calculate Arcsine Value

fabs()

Get Absolute Value

sinh()

Hyperbolic Sine Function

hypot()

Calculate Hypotenuse Length

atan2()

Compute Arc Tangent

atanh()

Compute Hyperbolic Arctangent

stdio.h

clearerr()

Clear Stream Error