Program is to perform string operations:

Program is to perform string operation without using in built functions using classes and object

void mainmenu()

   {

   clrscr();

   cout<<"\n\t   Enter your choice\n ";

   cout<<"\n\t1. to read the string ";

   cout<<"\n\t2. to display the string ";

   cout<<"\n\t3. to reverse the string ";

   cout<<"\n\t4. to capitalize the string ";

   cout<<"\n\t5. to copy the string into an empty string";

   cout<<"\n\t6. to count the no. of vowels [upper and lower case] ";

   cout<<"\n\t7. Quit ";

   cout<<"\n\n\t Enter choice ";

   }

 class string

   {

   private:

                  char str[100];

   public:

                  void read();

                  void display();

                  void capital();

                  void copying();

                  void reverse();

                  void vowel();

                  void quit()

                {

                exit(0);

                }

   };

  void string::read()

                {

                cout<<" enter a string ";

                gets(str);

                }

  void string::display()

                {

                cout<<" the string you have entered  is "<

                getch();

                }

  void string::reverse()

                {

                 int count=0;

                 char temp;

                 for (int i=0;str[i]!= NULL;i++)

                  count++;

                  for(i=0;i<=count/2;i++)

                   {

                   temp=str[i];// reverse 1st string

                   str[i]=str[count-1-i];

                   str[count-1-i]=temp;

                   i++;

                   }

                   cout<<" reversed "<

                   getch();

                 }

  /*  void string::capital()

                 {

                  }*/

  void string::copying()

   {

                char tempstr[100];

                int i=0;

                while(str[i]!=NULL)

                 {

                 tempstr[i]=str[i];

                 i++;

                 }

                 cout<<" the string copied into a new empty string "<

                 getch();

   }

 void string::vowel()

  {

   int count=0;

   int i=0;

   while (str[i]!=NULL)

                {

   if(str[i]=='a' || str[i]=='e' || str[i]=='i' || str[i]=='o' ||str[i]=='u')

                 {

                count++;

                i++;

                 }

                cout<<" the vowels in lower case "<

/*   else

   if(str[i]=='A' || str[i]=='E' || str[i]=='I' || str[i]=='O' || str[i]=='U')

                  {

                  counti++;

                  i++;

                  }

                 cout<<" the vowels in upper case "<

                }

  }

 void main()

  {

  int n;

  string option;

   do

                {

                 mainmenu();

                  cin>>n;

                   switch(n)

                                {

                                case 1:option.read();

                                                   break;

                                case 2:option.display();

                                                   break;

                                case 3:option.reverse();

                                                   break;

                //            case 4:option.capital();

                                                   //break;

                                case 5:option.copying();

                                                   break;

                                case 6:option.vowel();

                                                   break;

                                case 7:exit(0);

                                                   break;

                                default: cout<<" wrong choice ";

                                }

                }while(n!='7');

  }