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check an phone number area code with strncmp

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The phone number should be ###-###-####, which is including the dash. I am writing a function to determine whether a string form a phone format and a right area code checking for a three character combination followed by a dash. however, if I put dash in the string, it means to subtract. How can I avoid that?
function y = areacode(pnumber)
usernum = input('Enter your number with dash : ' )
if strncmp(pnumber,usernum,4)== 1
disp('The area code is same!')
else
disp('The area code is not same.')
end
end

Accepted Answer

Phillip
Phillip on 18 Nov 2014
Hi
Type
help input
at the command prompt and have a look at what it says. Your answer is right there.
Regards, Phil
  2 Comments
jarvan
jarvan on 18 Nov 2014
i should put in '' to avoid it ,thank you
Guillaume
Guillaume on 18 Nov 2014
You should put in 's' as in
input('enter your number', 's')

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