Counting all numbers after decimal point.

Question

Jonathan 2014-4-2

0
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https://ww2.mathworks.cn/matlabcentral/answers/124213-counting-all-numbers-after-decimal-point

回答： Walter Roberson 2014-4-2

采纳的回答： Walter Roberson

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Hello everyone,

I have the following program:

function [ dec ] = digits( x )
% DETERMINE how many digits you have in x.
% dec       digits after the comma  (decimal).
%%COUNT the digits after the comma.
x = abs(x); %in case of negative numbers
dec = 0;
n=0;
y = x*10^n;
while (floor(y)~=y)
    dec = dec + 1;
    n   = n + 1;
    y = x*10^n;
end
end
  end

This works for nearly every number except, for example when I use it on 0.0221. My program then gives me as answer '5' yet I don't understand why. Is there anybody here who can help me?

Thanks in advance!

Jonathan