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writing a program on matlab

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m_vdv
m_vdv 2018-2-18
评论： Walter Roberson 2018-2-18
Hi, I have to write a program that asks you to enter a number and then shows how many digits it has. Who can help me?
  1 个评论
Walter Roberson
Walter Roberson 2018-2-18
The first step is to define exactly all of the forms of representation of numbers that are to be permitted. For example, is the user permitted to have spaces between a negative sign and what follows? When the number has absolute magnitude less than 1, is the user permitted to omit the leading 0? Which exponent characters are permitted? Is the optional '+' allowed for positive exponents? What is the maximum length of input that is required to be processed properly? Will you permit Ɔ and ↀ when the user gives Roman Numeral input?

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采纳的回答

Birdman
Birdman 2018-2-18
a=input('Enter a number\n');
dig=numel(num2str(a))
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显示 1更早的评论
Image Analyst
Image Analyst 2018-2-18
If you don't want to count decimal points (commas or dots), you can do this:
str = input('Enter a number ');
% Convert to string
str = num2str(str)
% Get rid of decimals and commas
str = strrep(str, '.', '');
str = strrep(str, ',', '');
% Now count digits
numberOfDigits = numel(str)
Walter Roberson
Walter Roberson 2018-2-18
numel(num2str(18446744073709551615))
ans =
21
>> numel('18446744073709551615')
ans =
20

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