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ViolentAJ

Joined: 05 Feb 2009
Posts: 56

Posted: Sat Apr 18, 2009 8:49 pm Post subject: Object-oriented troubles

I had a similar problem before, but it was easily solved. This time, I don't know what's wrong. I have a few classes for a basic RPG type battle.

Character:

Code:

//This will be a character super class for possible characters in an RPG game.

//This is a simple example for the project. At a later date, I hope to include a stats system so that
//character-specific methods may be better overridden. For now, I just used "abstract" methods.

module Character;

import std.stdio;
import AJRandom; //random numbers

public class Character {

//Instance variables
protected:
   final string NAME; //The character's name
   int health; //The character's HP
   int maxHealth; //Maximum health
   AJRandom gen; //Random generation

//Methods
public:
   //Constructor. Blank for this superclass
   this(){
      gen = new AJRandom();
   }

   //Method to reduce the health of this character
   void takeDamage(int n){
      this.health -= n;
   }

   //Method to inflict damage on an enemy
   void dealDamage(Character other, int n){
      other.takeDamage(n);
      writefln("%d attacks %d for %d damage!", this.NAME, other.getName(), n);
   }

   void attack();

   //Method to self-heal
   void heal(int n){
      if((this.health - n) < this.maxHealth){
         this.health += n;
      } else {
         this.health = this.maxHealth;
      }
      writefln("%d rests and heals %d HP", this.NAME, n);
   }

   void selfHeal();

   void printStats(){
      writefln("%d has %d HP remaining.", this.NAME, this.health);
   }

   string getName(){
      return this.NAME;
   }

}

Mitsuki:

Code:

//Mitsuki is a character, thus, she will extend from the Character class.

module Mitsuki;

import Character;

//We use a colon (:) to indicate that Mitsuki inherits from Character
public class Mitsuki : Character {

//Character-specific constructor.
public:
   this(){
      this.NAME = "Mitsuki";
      this.health = this.maxHealth = 100;
   }

   //Override the abstract attack and selfHeal methods
   void attack(Character other){
      //Mitsuki's attacks will do from 10 to 20 damage
      this.dealDamage(other ,10 + this.gen.getNumber() % 11);
   }

   void selfHeal(){
      //Mitsuki can heal herself from 5 to 30 HP
      this.heal(5 + this.gen.getNumber() % 26);
   }
}

Enemy:

Code:

//An enemy for Mitsuki to fight

module Enemy;

import Character;

public class Enemy : Character {
// Character-specific constructor.
public:
   this(){
      this.NAME = "Enemy";
      this.health = this.maxHealth = 75;
   }

   //The client can give the enemies names with this overrided constructor
   this(string onamae){
      this.NAME = onamae;
      this();
   }

   void attack(Character other){
      //Enemy's attacks will do from 5 to 40 damage
      this.dealDamage(other ,5 + this.gen.getNumber() % 36);
   }

   void selfHeal(){
      //The enemy can heal from 2 to 10 HP
      this.heal(2 + this.gen.getNumber() % 9);
   }
}

AJRandom

Code:

//Class to return a random number

module AJRandom;

import std.stdio;
import std.c.stdlib;
import std.c.time;

public class AJRandom {
public:
   this();

   //Method to generate a random number
   int getNumber(){
      srand(time(null));

      int number = rand();

      return number;
   }
}

And finally, the GameClient

Code:

module GameClient;

import std.stdio; //I must remember the import declarations go under module
import Character;
import Enemy;
import Mitsuki;

void main(string[] args){
Mitsuki mitsuki = new Mitsuki();

mitsuki.printStats();
}

I get the following printout:

Code:

OPTLINK (R) for Win32 Release 8.00.1
Copyright (C) Digital Mars 1989-2004 All rights reserved.
.\_Character.obj(_Character)
Error 42: Symbol Undefined _D8AJRandom8AJRandom5_ctorMFZC8AJRandom8AJRandom
.\_Character.obj(_Character)
Error 42: Symbol Undefined _D9Character9Character8selfHealMFZv
.\_Character.obj(_Character)
Error 42: Symbol Undefined _D9Character9Character6attackMFZv
--- errorlevel 3

ViolentAJ

Joined: 05 Feb 2009
Posts: 56

Posted: Sat Apr 18, 2009 9:00 pm Post subject:

Well, I fixed it by changing the empty methods from method(); to

Code:

method() {

}

Now, when I try to run it, I get the following erro (it compiles but actually running the .exe):
Error: std.format string

Can anyone tell me what's wrong?

ViolentAJ

Joined: 05 Feb 2009
Posts: 56

Posted: Sat Apr 18, 2009 9:04 pm Post subject:

Nevermind. I have to use "%s" for strings and %d" for numbers. I'm very sorry for wasting your time. Thanks anyway.

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