How can I include leading zeros in a number?
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I've created a code that requires the user to input a number of their choice. Their number must follow a set of rules, the first being that it must be 6 digits otherwise an error message occurs.
If the user types a number such as 012345, MatLab discards the zero and counts it as a 5 digit number (12345). If I would like MatLab to understand that this is actually a 6-digit number, how would i go about that?
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Answers (2)
Cedric
on 6 Oct 2017
Edited: Cedric
on 6 Oct 2017
Store/read the user input as a string.
Or, if you want to bring some flexibility, allow users to enter integers without leading zeros, but then when it becomes important to use/display them with leading zeros, print them on 6 digits with a 0 padding:
n = 12 ; % Stored or entered by user.
n_strPadded = sprintf( '%06d', n ) ;
with that you get:
n_strPadded =
'000012'
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Real User
on 11 Jan 2024
Great except that it counts the minus sign as one "zero". Thus, sprintf('%06d', n) works if n>=0 but sprintf('%07d', n) if n<0. Is there any way to say that I want 6 numbers whether n<0 or not?
Stephen23
on 11 Jan 2024
"Is there any way to say that I want 6 numbers whether n<0 or not?"
I guess you mean digits, not numbers. Here are two approaches:
n = +4;
sprintf('%0*d',(n<0)+6,n)
n = -4;
sprintf('%0*d',(n<0)+6,n)
OR
n = +4;
sprintf('%+07d',n)
n = -4;
sprintf('%+07d',n)
Walter Roberson
on 8 May 2018
Use input with the 's' option, and test for length() 6 and that it contains only digits.
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