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
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