While loop doesn't terminate

In an attempt to have Matlab compute the sum S = 0.1 + 0.2 + . . . + 0.9, someone writes the following code:

s = 0 
x = 0 
while x~=1.0 
    s = s + x 
    x = x + 0.1 
end 
S = s 

(a) Test this code on Matlab. Why does the program keep running indefinitely? Note: to terminate the procedure, place the cursor in the command window and press Ctrl + C.

(b) What should be changed in the code to make it stop?

[Rik]

You can find guidelines for posting homework on this forum here.

For this specific question, I suggest using the debugger to step through your code line by line.

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F