(Tokenizing Phone Numbers) Write a program that inputs a telephone number as a string in the form [phone]. The program should use function strtok to extract the area code as a token, the first three digits of the phone number as a token, and the last four digits of the phone number as a token. The seven digits of the phone number should be concatenated into one string. Both the area code

Question

and the phone number should be printed.

What will be an ideal response?

Answer 1

```
#include
#include
#include
using namespace std;

int main()
{
const int SIZE1 = 20;
const int SIZE2 = 10;

char p[ SIZE1 ];
char phoneNumber[ SIZE2 ] = { '\0' };

char *tokenPtr; // store temporary token
char *areaCode; // store area code
char *phone; // store the phone number

cout << "Enter a phone number in the form [phone]:\n";
cin.getline( p, SIZE1 );

// pick apart the area code from the entire string
areaCode = strtok( p, "()" );

// function strtok to take the next token in the string
tokenPtr = strtok( 0, "-" );

// copies the result from the second call to strtok into phoneNumber
strcpy( phoneNumber, tokenPtr );

// the last call to strtok to take the last 4 digits
tokenPtr = strtok( 0, "" );

// concatenate the result with the current phoneNumber
strcat( phoneNumber, tokenPtr );

phone = phoneNumber;

cout << "\nThe area code is " << areaCode
<< "\nThe phone number is " << phone << endl;

return 0; // indicates successful termination
} // end main
```
Enter a phone number in the form [phone]:
[phone]
The area code is 555
The phone number is 4294195