if Statement in C | ShreeSanaviAcademy Portal for Students

Introduction Generations of Computers Classification of Computers Basic Anatomy of a Computer System Memory Management Computer Software Operating System

Algorithm Flowcharts

Programming Language Generations of Programming Languages Introduction to C Structure of C Programming Language Integrated Development Environment First C program, Hello World Executing a C Program Constants in C Variables in C C Storage Classes and Storage Class Specifiers

Introduction Arithmetic operators Relational Operators Logical Operators Assignment Operator Increment and Decrement Operators Conditional Operators Bitwise Operators Precedence and Associativity

Control Instructions in C if Statement in C if-else Statement Nested if-else statement else if ladder Switch Statements in C

Loops Introduction for Loop while loop in C do-while Loop break and continue statements

Array in C One Dimensional array Two Dimensional Array Multidimensional Arrays

Modular Programming Functions

Searching Techniques Linear Search Algorithm Binary-Search-Algorithm

Sorting Introduction Bubble Sort

What is Strings Standard Library String Functions

Structure Introduction Defining a Structure Declaration of Structure Example of Structure Union Introduction Defining a Union Accessing Union Members

Pointers in C Accessing the Address of a variable Pointer Operations

Dynamic Memory Allocation

The if Statement

C uses the keyword if to implement the decision control instruction. The general form of if statement looks like this:

Syntax :

if ( this condition is true )
{
               Statement No 1
               Statement No 1
               .
               .
                Statement No N
}
next_statement;

The if statement by itself will execute a single statement, or a group of statements when the expression following if evaluates to true. It does nothing when the expression evaluates to false.

Note :

More than one condition can be Written inside the If statement.
Opening and Closing Braces are required only when “Code” after if a statement occupies multiple lines.
Code will be executed if the condition statement is True.
Non-Zero Number Inside if means “TRUE Condition”

Note: As a general rule, we express a condition using C’s ‘relational’ operators. The relational operators allow us to compare two values to see whether they are equal to each other, unequal, or one is greater than the other.

void main( )
{
int num ;
printf ( "Enter a number less than 5 " ) ;
scanf ( "%d", &num ) ;
if ( num <= 5 )
printf ( "Correct!" ) ;
getch();
}

On execution of this program, if you type a number less than or equal to 5, you get a message on the screen through printf( ). If you type some other number the program doesn’t do anything.

Fundamentals of the Computer System

Introduction to Algorithm

Programming Basics

Operators in C

Conditional Branching

Iteration and Loops

Array in C

Functions in C

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Strings

Structures and Union

Pointers in C

File Handling in C

Advanced

The if Statement

Syntax :