C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast

Operators

What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement

Looping

What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop

Functions

What is Function C User Defined Functions C Recursion C Passing Parameters

Scope

Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register

Array

What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings

String

What is String C String Functions

Pointer

What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer

Structure

What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def

Union

What is Union

Files

What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

C Interview

C Interview Sets All Star Patterns All Number Patterns All Alphabet Patterns All Series Patterns
The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Keywords

Basic Program

Keywords are those words which tells the compiler what to do . In C Programming, keywords are otherwise said to be reserved words.

Keywords in C

Keywords Rules

  • Keywords are always in lowercase letters.
  • Keywords cannot be changed by a programmer.
  • Keywords cannot be used as variable name, function name, array name by a programmer.

Keywords Bad Practices

Keywords in Uppercase letters can be used as identifiers but considers as a poor programming practice.

Program For Verification

keywords.c
#include <stdio.h>
int main()
{
int BREAK = 1;
printf("The value of BREAK = %d ",BREAK);
return 0;
}
  • The value of BREAK = 1

Note:

Here we used BREAK as an identifier, but the compiler haven't through any error instead it replied with an output.

List Of All Keywords

There are 32 keywords defined in C Programming.

auto extern sizeof
break float static
case for struct
char goto switch
const if typedef
continue int union
default long unsigned
do register void
double return volatile
else short while
enum signed -

Most frequently Keywords

Here we extract the keywords as per usage to make a clarity view.

Keywords Datatypes

char long union
double short unsigned
float signed void
int struct -

Keywords Conditioning Looping

case else switch
default for while
do if -

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