check an phone number area code with strncmp

Question

jarvan 2014-11-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/163162-check-an-phone-number-area-code-with-strncmp

评论： Guillaume 2014-11-18

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