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Standard Library

cctype

isalpha()

Check if Alphabetic Character

isdigit()

Check if Digit Character

isblank()

Check for Blank Character

isspace()

Check for Whitespace Character

isxdigit()

Check if Hexadecimal Digit

islower()

Check Lowercase Character

ispunct()

Check if Punctuation Character

isupper()

Check if Uppercase Character

tolower()

Convert to Lowercase Character

toupper()

Convert to Upper Case

cstring

strlen()

Get String Length

strcmp()

Compare Two Strings

memset()

Set Memory Block

strtok()

Tokenize String

memcpy()

Copy Memory Block

strstr()

Locate Substring

strncmp()

Compare String Parts

strchr()

Locate Character in String

strcpy()

Copy Strings

strncpy()

Copy Specified Characters

strcat()

Concatenate Strings

iostream

cin

Stream Input Data

cerr

Standard Error Stream

clog

Log Error Message

wcin

Wide Character Input

cout

Output Stream Object

wcout

Wide Character Output

cstdio

remove()

Delete File

scanf()

Read Formatted Input

snprintf()

Format Output String

rename()

Rename File

sscanf()

Parse Formatted String

tmpfile()

Create Temporary File

freopen()

Reopen Stream File

fscanf()

Read Formatted Input

sprintf()

Format and Store String

putchar()

Output a Character

fopen()

Open File Stream

fflush()

Flush Stream Buffer

fgets()

Read String from Stream

getc()

Get Character From Stream

fprintf()

Format and Print Text

getchar()

Read Single Character

printf()

Format and Print Data

fgetc()

Get a Character

fseek()

Set File Position

fread()

Read Binary Data

gets()

Read String From Stdin

fwrite()

Write Binary Data

puts()

Write String to Stdout

cstdlib

free()

Release Memory

div()

Perform Integer Division

labs()

Compute Absolute Value

abs()

Compute Absolute Value

malloc()

Allocate Memory Block

atof()

Convert String to Float

calloc()

Allocate Zeroed Memory

realloc()

Resize Memory Block

bsearch()

Binary Search Function

getenv()

Get Environment Variable

strtoull()

Convert String to Unsigned Long Long

qsort()

Quick Sort Array

srand()

Seed Random Generator

strtol()

Convert String to Long

ctime

ctime()

Convert Time to String

gmtime()

Convert Time to UTC

strftime()

Format Date and Time

time()

Get Current Time

asctime()

Convert Time to String

localtime()

Convert Time to Local

clock()

Get Processor Time

difftime()

Calculate Time Difference

cmath

modf()

Split Floating-Point Number

tan()

Calculate Tangent Function

trunc()

Truncate Floating Point

sin()

Calculate Sine Value

sqrt()

Calculate Square Root

acos()

Calculate Arc Cosine

atan2()

Compute Arc Tangent

asin()

Compute Arcsine Value

floor()

Round Down to Integer

log()

Calculate Natural Logarithm

nan()

Generate NaN Value

log2()

Calculate Base-2 Logarithm

abs()

Compute Absolute Value

cos()

Calculate Cosine Value

fmod()

Modulus of Floats

fmax()

Find Maximum Value

atan()

Calculate Arc Tangent

pow()

Calculate Power

remainder()

Compute Remainder

exp()

Calculate Exponential Function

round()

Round to Nearest Integer

ceil()

Round Up to Integer

fabs()

Compute Absolute Value

log10()

Calculate Base-10 Logarithm