C if else Statement

The if statement in C language is used to perform operation on the basis of condition. By using if-else statement, you can perform operation either condition is true or false.

There are many ways to use if statement in C language:

• If statement
• If-else statement
• If else-if ladder
• Nested if

If Statement

The single if statement in C language is used to execute the code if condition is true. The syntax of if statement is given below:

if(expression){  

//code to be executed  

} 

Flowchart of if statement in C

Let's see a simple example of c language if statement.

#include<stdio.h>  

#include<conio.h>  

void main(){  

int number=0;  

clrscr();  

  

printf("enter a number:");  

scanf("%d",&number);  

  

if(number%2==0){  

printf("%d is even number",number);  

}  

  

getch();  

}  

Output

enter a number:4

4 is even number

If-else Statement

The if-else statement in C language is used to execute the code if condition is true or false. The syntax of if-else statement is given below:



if(expression){  

//code to be executed if condition is true  

}else{  

//code to be executed if condition is false  

} 

Flowchart of if-else statement in C



Let's see the simple example of even and odd number using if-else statement in C language.\



#include<stdio.h>  

#include<conio.h>  

void main(){  

int number=0;  

clrscr();  

  

printf("enter a number:");  

scanf("%d",&number);  

  

if(number%2==0){  

printf("%d is even number",number);  

}  

else{  

printf("%d is odd number",number);  

}  

getch();  

} 

Output


enter a number:4

4 is even number



enter a number:5

5 is odd number



If else-if ladder Statement

The if else-if statement is used to execute one code from multiple conditions. The syntax of if else-if statement is given below:



if(condition1){  

//code to be executed if condition1 is true  

}else if(condition2){  

//code to be executed if condition2 is true  

}  

else if(condition3){  

//code to be executed if condition3 is true  

}  

...  

else{  

//code to be executed if all the conditions are false  

} 




Flowchart of else-if ladder statement in C



The example of if-else-if statement in C language is given below.



#include<stdio.h>  

#include<conio.h>  

void main(){  

int number=0;  

clrscr();  

  

printf("enter a number:");  

scanf("%d",&number);  

  

if(number==10){  

printf("number is equals to 10");  

}  

else if(number==50){  

printf("number is equal to 50");  

}  

else if(number==100){  

printf("number is equal to 100");  

}  

else{  

printf("number is not equal to 10, 50 or 100");  

}  

getch();  

}




Output


enter a number:4

number is not equal to 10, 50 or 100



enter a number:50

number is equal to 50