#include <iostream>
using namespace std;
 
void main ()
{
    char *tokenString, *c, string[80];
 
    cout << "Input a string: ";
    cin.getline(string, 80);
    cout << "The entered string is: " << string << endl;
    c = string;
    while (*c)
    {
        if ((*c >= 'a') && (*c <= 'z'))
            *c = (*c - 'a') + 'A';
        ++c;
    }
    cout << "The string in all upper case letters is: " << string << endl;
 
	tokenString = string;
	char *tokenPtr, *nullPtr= NULL;
 
   cout << "The string to be tokenized is:\n" << tokenString
        << "\n\nThe tokens are:\n";
 
   tokenPtr = strtok( tokenString, " " );
 
   while ( tokenPtr != NULL ) {
      cout << tokenPtr << '\n';
      tokenPtr = strtok(nullPtr, " " );
   }
}

   while (*c)
    {
       *c = toppper(*c);
        ++c;
    }

char *array[255] = {0}; // room for 255 strings
int i = 0;
...
array[i] = tokenPtr;