how to count a number of digits.

How to count a number of digits in a given number withoud using numel and length(num2string()). probably use for loop or while loop.

Answer 1

[Walter Roberson]

Well, there is log10(). Or there is counting digits upward until your number is smaller than 10^digits. There are other counting methods too.

One question you are going to have to deal with is what to do if the number is negative. Another question to deal with is what to do if the number is between -1 and +1, such as 0.00043

[komal Bhandari]

how to give a error message if the user enter nothing while recalling a function.

[Jan]

@Komal: How do you detect, that the user does not enter something? Usually error messages are created by the function "error('my message')".

[komal Bhandari]

i know but i mean to say if there any word to describe the no value situation..

[komal Bhandari]

I got it sir. do not worry.

Answer 2

[Jake Bolanski]

I'd go with what Walter mentioned. However, in general length is the ideal way to go.

[Walter Roberson]

length() of the formatted string is considerably slower than log10.

Answer 3

[Melisa Sahin]

How counts of number digits use a recursion function ?