C++   How to Program (Early Objects Version)
C++ How to Program (Early Objects Version)
10th Edition
ISBN: 9780134448824
Author: Paul Deitel; Harvey M. Deitel
Publisher: Pearson Education (US)
Question
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Chapter 13, Problem 13.14E
Program Plan Intro

Program Plan:

  • Insert required header Files
  • Create new file PhoneNumber.h.
  • Make a class PhoneNumber and declare extraction and insertion operators as friend to class.
  • Declare three string variable “ areacode ”, “ exchange ”, “ line ” and one character array “ phno ” to get phone number in an array.
  • End header class.
  • Close and save header file.
  • Create new file Phonenumber.cpp. This will contain definitions and modification required in extraction operator ">>".
  • Include header files, must include PhoneNumber.h
  • Overload the insertion operator to display areacode, exchange and line.
  • Make changes the extraction operator definition.
  • use "getline()" function to get input into "phno". The "getline()" function is used to identify psaces also.
  • Use if construct to check various conditions
  • Check for length of input entered which should be 14, use input.clear(ios::failbit) to set failbit.
  • Check that areacode does not start with either 0 or 1, if it does then use input.clear(ios::failbit) to set failbit.
  • Check that exchange does not start with either 0 or 1, if it does then use input.clear(ios::failbit) to set failbit.
  • Check that middle digit of areacode should be either 0 or 1, if not then use input.clear(ios::failbit) to set failbit.
  • If all the conditions are false, this means that input is correct, thus put them into areacode, exchange and line of number object passed through the function.
  • return input
  • end function
  • Make new C++ file for main() function.
  • Include header files, must include PhoneNumber.h.
  • Start main function.
  • Declare an object of PhoneNumber class phone.
  • Display message to enter phone number.
  • Use cin>>phone which will call overloaded extraction operator.
  • Check whether state returned is goodbit(incase failbit is not set in the function) then display phone number else display error.
  • Return and exit.

Program Description:

Program to get correct input by overloading extraction operator.

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