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 −
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 −
-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 −