Declaration of Expr

• class Expr {
  public:
  Expr(int);
  Expr(const char*, const Expr&);
  Expr(const char*,
  const Expr&, const Expr&);
  Expr(const Expr&);
  Expr& operator=(const Expr&);
  ~Expr();

• void print(FILE*) const;
  int eval() const;
  };

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