String length cpp program

CPP program to find length of  a string

#include<iostream.h>

#include<conio.h>

class length

{         char str[100];

   public:

          void find();

};

void length::find()

{        int i=0;

          cout<<" Enter a String : ";

          cin>>str;

          while(str[i]!='\0')

          {        i++;}

          cout<<" String contains "<<i<<" letters";

}

void main()

{        clrscr();

          length l;

          l.find();

          getch();

}