ex10_2.cpp

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// ex10_2.cpp
// member function converts String objects to upper case
#include <iostream>
#include <cstring>       //for strcpy(), etc
#include <cctype>        //for toupper()
using namespace std;
////////////////////////////////////////////////////////////////
class String             //user-defined string type
   {
   private:
      char* str;                    //pointer to string
   public:
      String(char* s)               //constructor, one arg
         {
         int length = strlen(s);    //length of string argument
         str = new char[length+1];  //get memory
         strcpy(str, s);            //copy argument to it
         }
      ~String()                     //destructor
         { delete str; }
      void display()                //display the String
         { cout << str; }
      void upit();                  //uppercase the String
   };
//--------------------------------------------------------------
void String::upit()                 //uppercase each character
   {
   char* ptrch = str;               //pointer to this string
   while( *ptrch )                  //until null,
      {
      *ptrch = toupper(*ptrch);     //uppercase each character
      ptrch++;                      //move to next character
      }
   }
////////////////////////////////////////////////////////////////
int main()
   {
   String s1 = "He who laughs last laughs best.";

   cout << "\ns1=";       //display string
   s1.display();
   s1.upit();             //uppercase string
   cout << "\ns1=";       //display string
   s1.display();
   cout << endl;
   return 0;
   }