Chapter 4: Programming in Matlab - College of the Redwoods

Section 4.2 Control Structures in Matlab 301
if logical_expression
statements
else
statments
end
In this form, if the logical_expression evaluates as true (logical 1), the block
of statements between if and else are executed. If the logical_expression
evaluates as false (logical 0), then the block of statements between else and end
are executed.
We can provide an alternative to our evenodd.m script. Add the following
lines to the script and resave as evenodd.m.
n = input(’Enter an integer: ’);
if (rem(n,2)==0)
fprintf(’The integer %d is even.\n’, n)
else
fprintf(’The integer %d is odd.\n’, n)
end
Run the program, enter 17, and note that we now have a different response.
>> evenodd
Enter an integer: 17
The integer 17 is odd.
Because the logical expression rem(n,2)==0 evaluates as false when n = 17,
the fprintf command that lies between else and end is executed, informing us
that the input is an odd integer.
Elseif
Sometimes we need to add more than one alternative.
following structure.
For this, we have the