Thread: newbie needs help with strtok function

Why bother with strtok, why not use the string class.
To get you started :

Code:

#include <iostream>
#include <stdlib.h>
#include <string>

int main()
{
      string phone;
      cout << "input phone number : \t";
      getline(cin, phone);

      system("PAUSE");
      return 0;
}

You'll find all the methods you need right here

does ptr* mean pointer?

ptr* means whatever ptr is multiplied by whatever comes after ptr, ptr is just a name for, I would assume, a variable of pointer type, but people can be stupid about such things.

int* ptr; // ptr is a variable of type pointer to int
int *ptr; // same thing
ptr = 0; // sets the pointer to point to nothing
*ptr = 0; // sets whatever int lives at the address held in pointer to zero, if ptr == 0 this will probably crash, unless you are relying on the program crashing, in this case the program will send gay porn to your mother.

This dude is probably from Penn State taking
either CMPSC 201c or CSE 103 (or variants of the same
course)

But anyway... here's what I did when I took that
class

Code:

//[MOONWALKER]
//Lab assignment 13

#include <iostream>
#include <string>

using namespace std;

//precondition: a sting message is passed
//postcondition: displays an error and terminates the program
void PhoneError(string message)
{
	//showing the error message intended
	cout << "Your call cannot be completed because: " << endl;
	cout << message << endl;
	//exiting the program
	exit(1);

}

//precondition: a sting is passed
//postcondition: nothing happens if it is valid. otherwise program terminates
void CheckValidity(string aString)
{ 

		int i;

		//if the size is other than 7 or 11
		if ( aString.size() != 11 &&  aString.size() != 7)
		{
			PhoneError("A phone number should have 7 or 11 characters");
			
		}
		//if the number is 11 digits and doesn't start with 1
		else if (aString.size() == 11 && aString.substr(0,1) != "1")
		{
			PhoneError("A long distance call must begin with 1");
		}
		//if the number is 7 digits and starts with a 0 or a 1
		else if (aString.size() == 7 && aString.substr(0,1) == "1" || aString.substr(0,1) == "0")
		{
			PhoneError("A call cannot start with a 0 or a 1");
		}
		//checking if the number contains any illegal characters
		for (i = 0; i < aString.size(); i++)
		{
			if (aString.substr(i, 1) < "0" || aString.substr(i, 1) > "9")
			{
				PhoneError("A phone number must consist of all digits");
			}
		}
}




int main()
{
	//setting up variables
	string phonenumber, newformat;
	
	//taking the input
	cout << "Enter a phone number: ";
	cin >> phonenumber;

	//checking the validity of the input using the CheckValidity function	
	CheckValidity(phonenumber);

	//showing the output based on the size of the given number
	if (phonenumber.size() == 11)
	{
		newformat = "(" + phonenumber.substr(1, 3) + ")-" + phonenumber.substr(4, 3) + "-" + phonenumber.substr(7, 4);
	}
	else if(phonenumber.size() == 7)
	{
		newformat = phonenumber.substr(0,3)+ "-" + phonenumber.substr(3, 4);
	}

	//printing the number as desired
	cout << newformat << endl;

	return 0;

}