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In this guide, we will discuss If statement in Erlang. The first decision making statement we will look at is the ‘if’ statement. The general form of this statement in Erlang is shown in the following program −

Syntax

if
condition ->
   statement#1;
true ->
   statement #2
end.

In Erlang, the condition is an expression which evaluates to either true or false. If the condition is true, then statement#1 will be executed else statement#2 will be executed.

The following program is an example of the simple if expression in Erlang −

Example

-module(helloworld). 
-export([start/0]). 

start() -> 
   A = 5, 
   B = 6, 
   
   if 
      A == B -> 
         io:fwrite("True"); 
      true -> 
         io:fwrite("False") 
   end.

The following important things need to be noted about the above program −

• The expression being used here is the comparison between the variables A and B.
• The -> operator needs to follow the expression.
• The ; needs to follow statement#1.
• The -> operator needs to follow the true expression.
• The statement ‘end’ needs to be there to signify the end of the ‘if’ block.

The output of the above program will be −

Output

False

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