Walk1 a walkthrough with templates

/*ABCDEFGHIJKLMNOPQRSTUVWXYZ*/
#include <iostream.h>

class Worm{
  int stuff_;
public:
  Worm(int x=5){
    cout << "Making a Worm. " << endl;
    stuff_=x;
  }
  void operator=(int x){stuff_=(x>0)?x:x+4;}
  void operator=(const Worm& w){
    stuff_=w.stuff_;
    cout << "From one worm to another" << endl;
  }
  int stuff(){return stuff_;}
};
char operator-(char c,Worm& w){
  return c-w.stuff();
}
ostream& operator<<(ostream& os,Worm& w){
  os << "A worm: " << w.stuff();
  return os;
}
template <class t>
class Bird{
  char str_[50];
  t val_;
public:
  t val(){return val_;}
  char* str(){return str_;}
  Bird(t val,char* s){
    cout << "Fly Birdie! Fly!" << endl;
    strcpy(str_,s);
    val_=val;
  }
  void Fly();
  ~Bird();
};
template <class t>
void Bird<t>::Fly(){
  for(int i=0;i<strlen(str_);i++){
    str_[i]=str_[i]-val_;
  }
}
template <class t>
Bird<t>::~Bird(){
  for(int i=0;i<strlen(str_);i++){
    if(i%2==0)
      str_[i]=str_[i]-val_;
  }
  cout << "Bye Bye Birdie!" << endl;
  cout << str_ << endl;
  cout << val_ << endl;
}

int main(void){
  Worm wormy;
  wormy=-3;
  Bird<int> robin(2,"qwwjvqso");
  Bird<Worm> sparrow(wormy,"einptjpf");
  robin.Fly();
  sparrow.Fly();
  cout << robin.str() << endl;
  cout << sparrow.str() << endl;
}