The String Assignment

There are two ways to do strings.

You can use an array of chars, with a zero byte to indicate the end of the array.
class String
{
char *data; // Or char data[100];
}
You can use an array of chars, with a count to indicate how many elements are in the array.
class String
{
char *data; // Or char data[100];
int len;
}

You task is to implement a string class using BOTH methods. For each task below, you get points only if that task is completed for BOTH types of string.

Points	Task	Task #
.2	Has a contructor with no arguments	1
.2	Has a constructor that builds a string using a char* as input	2
.3	Can cout << the String	3
.2	Has an operator= that copy's a string into another string	4
.2	Has an operator= that copies a char* into a string	5
.4	Can concatenate the strings using '+'. String a("Hello"), b("Mommy"), c; c = a + b; // Yields "HelloMommy"	6
.4	Can subtract an int from a string to delete charactors String a("Hello"); String b = a-3; // Yields "He"	7
.4	Can access a particular element from the string using [] String a("hello"); cout << a[1]; // Prints a 'e'	8
1	Can work with strings of ANY positive length. You must have a destructor!	9
.4	Can tell if string a char contains a substring using "%". String a("hello"); if (a % 'e') // This is true	10
.6	Can tell if a string contains a substring using '%'. String a("Hello"), b("He"); if (a % b) // This is true	11
1	Turned in before Thursday October 31st.
-1	Turned in after Thursday Nov 7th
40,003	Includes the 'Buffy the Vampire Slayer' DVD collection

Sample code

int main()
{
	String scott;                                       // Task #1	
	String mom("mom");                                  // Task #2
	String brother;		                            // Task #1 again
	cout << "Mom is " << mom << endl;                   // Task 3
        brother = mom;                                      // Task 4
        brother = "Scott";                                  // Task 5

	String ans;                                         // Task 1 again
        ans = mom + scott;                                  // Tasks 4 and 6
        cout << ans << endl;                                // Task 3 again
        cout << "That should say momScott\n";


	for(int i = 0; i < 5; i++)
           cout << "Letter #" << i << " is " << brother[i] << endl;  // Task 8


        ans = ans - 3;                                      // Task 7
        cout << "That should say momSco\n";

        if (ans % 'o')                                      // Task 10
            cout << "% seems to work\n";
        else
            cout << "% was wrong!\n";

	if (ans % 'x')                                      // Task 10 again
             cout << "% was wrong!\n";
        else
             cout << "% was right again\n";

	if (ans % mom)                                      // Task 11
             cout << "% on 2 strings was right\n";
        else 
             cout << "% on 2 strings was wrong!\n";


	if (ans % scott)                                      // Task 11 again
             cout << "% on 2 strings was wrong\n";
        else 
             cout << "% on 2 strings was right!\n";
}