Introduction of C Programming Language C Character Set Constants, Variables, Keywords Rules for Integer Variables Values Rules for Floating Variables Values Rules for Character Variables Values First C program Comments in C The main() function printf() and scanf() Format Specifiers C Instructions Operators in C Type Conversions Control Instructions Decision Control If statement If-else statement Nested if-else Statement The Switch Statement Logical Operators Conditional Operator

Types of Loops While loop For Loop Do-while Loop Nesting of Loops Multiple Initializations in the for Loop The Break Statement The Continue Statement Difference Between While and Do-While Loop: The Goto Statement Programming Errors in C Language Practice Question on Constants

Functions in C Parameters in C Function Points to Remember Ways to Call a Function Difference Between Call by Value and Call by Reference Storage Classes in C Storage Classes Which Storage Class to Use When Difference Between Compile-Time and Run-Time Errors Letters and their ASCII values in C

Introduction to Pointers Pointer Notation Symbols used in Pointers in C Declaring a Pointer Null Pointers Enumeration (enum) in C

Type Casting in C Recursion in C Integers - Signed and Unsigned

Arrays in C Different Ways to Initialize All Members of an Array to The Same Value: 2-D Arrays in C Passing Array to a Function in C Points to Remember Arrays of Pointers Exercise

Strings in C Examples Standard Library String Functions Passing strings to a function Practice Question

Introduction Of Structures Accessing Structure Elements Features of Structures Uses of Structures Practice Questions

Union in C Declaring Union Input/Output Console Input/Output Functions Formatted Console I/O Functions Unformatted Console Input/Output Functions File Input/Output File Opening Modes Operations on Bits One’s Complement Operator

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The alphabets,digits,symbols when properly combined forms constants,variables and keywords.
Constants do not change whereas variables can be changed.
Variables are used to store data.It’s value can be changed and can be reused many times.

Rule to name Variables and Constants:

The first character of a variable or constant name must be an alphabet or underscore.
Variable or constant names can have alphabets,digits or underscores.
No commas or blanks are allowed within a name of variable or constant.
No special symbol other than underscore can be used.
Variable or constant name must not be any reserved word i.e keyword.

Keywords:

Keywords are the reserved words i.e the words whose meaning has already been explained to the computer.
These keywords cannot be used as variable or constant names because if we do so we are trying to assign a new meaning to the keyword,which is not allowed.

Declaration of Variables in C:

C compiler makes it compulsory to declare the types of any variable name that you wish to use in your code.This type declaration is done at the beginning of the program.
For example:

int marks;
float percentage;
char name;

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