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Programming with M-Files: While-Loop Drill Exercises

Module by: Darryl Morrell

Summary: This module provides several simple exercises designed to test and increase your understanding of while loops in m-files.

Some While Loop Exercises

Exercise 1

How many times will this loop print 'Hello World'? 


n = 10;
while n > 0
    disp('Hello World')
    n = n - 1;
end

Solution

10 times.

Exercise 2

How many times will this loop print 'Hello World'? 


n = 1;
while n > 0
    disp('Hello World')
    n = n + 1;
end

Solution

This loop will continue to print 'Hello World' until the user stops the program. You can stop a program by holding down the 'Ctrl' key and simultaneously pressing the 'c' key.

Exercise 3

What values will the following code print? 

a = 1
while a < 100
    a = a*2
end

Solution

a =
     1
a =
     2
a =
     4
a =
     8
a =
    16
a =
    32
a =
    64
a =
   128

Exercise 4

What values will the following code print? 


a = 1;
n = 1;
while a < 100
    a = a*n
    n = n + 1;
end

Solution


a =
     1
a =
     2
a =
     6
a =
    24
a =
   120

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