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.