A complete reference of the C programming language

Disclaimer: This blog post should not be interpreted as professional advice. I am not responsible for any actions taken based on this content and disclaim any liability for any resulting losses or damages.

I think C is an awesome programming language, mainly because of it's simplicity. This is why I decided to make this reference in order to have something to refer to when programming in C.

This reference will be updated periodically.

Keywords of the language

int - 32 bit integer.
double - 64 bit double precition decimal number.

Standard Library

stdio.h

void printf(char* format, ...);

string.h

size_t strlen(char* str);

int isalnum(int ch);

int isalpha(int ch);

int islower(int ch);

int isupper(int ch);

int isdigit(int ch);

int tolower(int ch);

int toupper(int ch);

stdbool.h

typedef int bool;

stdlib.h

void* malloc(size_t size);

void* calloc(size_t size, size_t num);

void* realloc(void* ptr, size_t size);

void free(void* ptr);

math.h

Defines common math function.

double fabs(double val);

double exp(double val);

double log(double val);

double pow(double base, double exp);

double sqrt(double val);

double sin(double val);

double cos(double val);

double tan(double val);

time.h

Time / date functions.

time_t time(time_t* arg);