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


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


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


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


Scope C Local Scope C Global Scope

Storage Classes

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


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


What is String C String Functions


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


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


What is Union


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

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C Interview

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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Enumeration or enum

An Enumeration is user defined data type. It uses the keyword enum. An enumerated type has a finite number of named values. Each named values assigned to integer constant in ascending order. The enumeration statement should starts with the keyword enum.

C program - Enumerations

Lets code Enumerations and have some fun.

#include <stdio.h>
int main()
//Enumeration declartion
enum week{ Sunday, Monday, Tuesday, wednesday, Thursday, Friday, Saturday } ;
printf("\nSunday = %d ", Sunday);
printf("\nWednesday = %d ", wednesday);
printf("\nSaturday = %d ", Saturday);
return 0;
  • Sunday : 0
  • Wednesday : 3
  • Saturday : 6


The above statement creates the user-defined data type week, and the members of enumeration are Sunday, Monday, Tuesday and so on. The first member starts with the value 0, and the last member ends with the value 6. Thus, the member values are increased one by one. If programmer assign a new integer value to the member then the order will be change according to the value. e.g.) if, Sunday=1 then the last member Saturday shows the value 7.

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