Create a program that will check the format for telephone numbers. Telephone num

Question

Create a program that will check the format for telephone numbers. Telephone numbers should be entered as a string with the ?rst three
characters followed by a dash and the last four numbers, e.g., 000-0000.
The program will check that a number entered contains eight characters
and has a dash after the ?rst three characters. Use string functions to
do the validation. Output a message that states whether the telephone
number is or is not in the proper format.

Write a piece of code which prints the characters in a cstring in a
reverse order
char s[10] = "abcde";
char* cptr;
//Your code here.

c++ is the one i need the code in.

Explanation / Answer

#include <iostream>

using namespace std;

int main()
{
   //PROTOTYPES
   bool isProperPhoneFormat(char *phoneString);

   //LOCAL DECLARATIONS
   const int BUF_SIZE = 100;
   char buf[BUF_SIZE];

   //PROCEDURES
   cout << "Enter the telephone number: ";
   cin.getline(buf, BUF_SIZE);
   if (isProperPhoneFormat(buf))
   {
      cout << "The phone number is in the PROPER format. ";
   }
   else
   {
      cout << "The phone number is NOT in the proper format. ";
   }

   cin.get();
   return 0;
}

//---------------------------------------------------------
// FUNCTION DEFINITIONS
//---------------------------------------------------------
bool isNumChar(char chr) // check whether chr is numeric character
{
   return (chr >= '0' && chr <= '9');
}
//---------------------------------------------------------
bool isProperPhoneFormat(char *phoneString)
{
   bool isNumChar(char chr);

   const int PROPER_PHONE_LEN = 8;
   char *ptr = phoneString;
   int phoneStringLength = 0;

   //check proper length
   while (*ptr++ != 0)
   {
      phoneStringLength++;
   }
   if (phoneStringLength > PROPER_PHONE_LEN)
   {
      return false;
   }
   //check first 3 numberic characters
   ptr = phoneString;
   while (ptr - phoneString < 3)
   {
      if (!isNumChar(*ptr++))
      {
         return false;
      }
   }
   //check the dash character
   if (*ptr++ != '-')
   {
      return false;
   }
   //check last 4 numberic characters
   while (ptr - phoneString < PROPER_PHONE_LEN)
   {
      if (!isNumChar(*ptr++))
      {
         return false;
      }
   }

   return true; //if phoneString satisfies all the conditions above
}

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