MATLAB - The if...elseif...elseif...else...end Statements

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An if statement can be followed by an (or more) optional elseif... and an else statement, which is very useful to test various condition.

When using if... elseif...else statements, there are few points to keep in mind:

  • An if can have zero or one else's and it must come after any elseif's.

  • An if can have zero to many elseif's and they must come before the else.

  • Once an else if succeeds, none of the remaining elseif's or else's will be tested.

Syntax:

if <expression 1>
% Executes when the expression 1 is true 
<statement(s)>
elseif <expression 2>
% Executes when the boolean expression 2 is true
<statement(s)>
Elseif <expression 3>
% Executes when the boolean expression 3 is true 
<statement(s)>
else 
%  executes when the none of the above condition is true 
<statement(s)>
end

Example

Create a script file and type the following code in it:

a = 100;
%check the boolean condition 
   if a == 10 
         % if condition is true then print the following 
       fprintf('Value of a is 10\n' );
    elseif( a == 20 )
       % if else if condition is true 
       fprintf('Value of a is 20\n' );
    elseif a == 30 
        % if else if condition is true  
       fprintf('Value of a is 30\n' );
   else
        % if none of the conditions is true '
       fprintf('None of the values are matching\n');
   fprintf('Exact value of a is: %d\n', a );
   end

When the above code is compiled and executed, it produces the following result:

None of the values are matching
Exact value of a is: 100


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