Erlang Multiple Expressions

Conditional Statements in Erlang

Syntax

if
condition1　->
　　　statement#1;
condition2　->
　　　statement#2;
conditionN　->
　　　statement#N;
true　->
　　　defaultstatement
end.

In Erlang, a condition is an expression that evaluates to true or false. If the condition is true, then statement # will be executed.1Otherwise, the next condition will be calculated in sequence. If no calculation result is true, then defaultstatement will be calculated.

The following diagram is a general illustration of the given statement above.

The following program isAn example of a simple if expression in Erlang-

Online Example

-module(helloworld).　
-export([start/0]).　
start()　->　
　　　A =　5,　
　　　B =　6,　
　　　if　
　　　　　　A == B　->　
　　　　　　　　　io:fwrite("A is equal to B");　
　　　　　　A < B　->　
　　　　　　　　　io:fwrite("A is less than B");　
　　　　　　true　->　
　　　　　　　　　io:fwrite("False")　
　　　end.

For the above program, the following key points should be noted-

• The expression used here is the comparison between variables A and B.

• -The > operator needs to follow an expression.

• Will;Needs to follow the statement #1.

• -The > operator needs to follow an expression of true

• The statement 'end' needs to indicate the end of the if block here.

The output of the above program will be-

Output Result

A is less than B

Conditional Statements in Erlang