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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


    simple example of c language if statement. 
    #include <stdio.h>  
void main(){  
int num=0;  
printf("enter a num:");  
scanf("%d",&num); 
if(num%2==0){  
printf("%d is even num",num);  
  }
  }  
Output:
enter a num:  12
12 is even num

    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>  
void main(){  
int numb=0;  
printf("enter a numb:");  
scanf("%d",&numb);  
 if(numb%2==0){  
printf("%d is even numb",numb);  
 }  
else {  
printf("%d is odd numb",numb);  
 }  
 } 
Output:
enter a numb:12
12 is even numb
enter a numb:7
7 is odd numb

    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>  
void main( ) {  
int number = 0;  
printf("enter a number:");  
scanf("%d",&number);  
if(number == 20) {  
printf("number is equals to 20");  
 }  
else if(number==60) {  
printf("number is equal to 60");  
 }  
else if(number==100)  {  
printf("number is equal to 100");  
  }  
else {  
printf("number is not equal to 20, 60 or 100");  
 }  
 }  
Output:
enter a number:10
number is not equal to 20,60 or 100
enter a number:60
number is equal to 60