if else if

if else if

An if statement can be followed by an optional else if...else statement, which is very useful to test various conditions using single if...else if statement.
Rule of if else if:

•   An if can have zero or one else's and it must come after any else if's.
•   An if can have zero to many else if's and they must come before the else.
•   Once an else if succeeds, none of the remaining else if's or else's will be tested.

Syntax:

[ Note: /*......................*/ is used only for comment ] 

The syntax of an if...else if...else statement in C programming language:

If (expression 1)

{

   /* Executes when the expression 1 is true */

}

else if (expression 2)

{

   /* Executes when the expression 2 is true */

}

else if (expression 3)

{

   /* Executes when the expression 3 is true */

}

else 

{

   /* executes when the none of the above condition is true */

}