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C if statement

 

The ability to change the behavior of a piece of code which is based on certain information in the environment is known as conditional code flow.

 

if Statement

If statement is used to test a condition, if condition is true then the code inside the if statement is executed otherwise that code is not executed.

Syntax

if(Boolean_expression)

{

// Body of if

}

if statemente.g.

#include<stdio.h>

#include<conio.h>

void main(){

int i=10;

clrscr();

if(i<=10){

printf(“value of i is less than or equal to 10”);

}

getch();

}

Output

value of i is less than or equal to 10

 

if else Statement

If Else is also used to test a condition, if condition is true then the code inside the if statement is executed otherwise else part is executed.

Syntax

if(Boolean_expression){

// Body of if statement

}else{

// Body of else statement

}

if else statement

 

e.g.

#include<stdio.h>

#include<conio.h>

void main(){

int i=10;

clrscr();

if(i<=10){

printf(“value of i is less than or equal to 10”);

}

else

{

printf(“value of i is greater than 10”);

}

getch();

}

Output

value of i is less than or equal to 10

 

 if…else if…else Statement

After if statement else if is used to check the multiple conditions.

Syntax

if(Boolean_expression1){

// Body of if statement

 

}

else if(Boolean_expression2){

//Body of else if

}

else{

// Body of else statement

}

e.g.

#include<stdio.h>

#include<conio.h>

void main(){

int i=10;

clrscr();

if(i<10){

printf(“value of i is less than 10”);

}

else if(i==10)

{

printf(“value of i is equal to10”);

}

else

{

printf(“value of i is greater than 10”);

}

getch();

}

Output

value of i is equal to10

 

Nested If Statement

It contains multiple if else condition. It is used to check the multiple conditions. This statement is like executing an if statement inside an else statement.

Syntax

if(Boolean_expression1){

//Body of if statement

if(Boolean_expression2)

{

//Body of nested if

}

}

…

else {

//Body of else statement

}

nestedif statemente.g.

#include<stdio.h>

#include<conio.h>

void main(){

int i = 20;

int j = 10;

if ( i < 30 ){

printf ("Value of i is less than 30");

if ( j == 10 ){

printf ("Value of j is equal to 10");

}

}

else

{

printf ("Value of i is not less than 30");

}

getch();

}

Output

Value of i is less than 30

Value of j is equal to 10

 

Switch Statement

It contains a number of cases with different conditions. When a variable value is matched with the case, then that case is executed.

Syntax

switch(expression){

case value1 :

//Statements

break;

case value2 :

//Statements

break;

case valuen :

//Statements

break;

default : //Optional

//Statements

}

switch

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