New to C++. Here is my code:
#include <string>
#include <cstdlib>
#include <time.h>
using namespace std;
const int Gardensize = 20;//Garden size, a 20X20 2d array
const int initialants = 100;//100 initial ants
const int initialdoodlebug = 5;//5 intial bug
const int antType = 1;//
const int doodleType = 2;//
const char antchar = 'O';//ant will display'O'in the window
const char bugchar = 'X';//
class Garden;
class Organism;
class Ant;
class Doodlebug;
class Garden {
friend class Organism;
friend class Ant;
friend class Doodlebug;
public:
Garden();
~Garden();
int checkType(int x, int y);//check the element type (ant or bug)in the grid
void Display();
private:
Organism grid[Gardensize][Gardensize]; //C2079 'Garden::grid' uses undefined class 'Organism' I have already define the class Organism in advance,have no ideal how to fix this error.
};
Garden::Garden() { //initialize the garden, set all elements in grid to "NULL"
for (int i = 0; i < Gardensize; i++) {
for (int j = 0; j < Gardensize; j++) {
grid[i][j] = NULL; //error:subscript requires array or pointer
}
}
}
Garden::~Garden() {
for (int i = 0; i < Gardensize; i++) {
for (int j = 0; j < Gardensize; j++) {
if (grid[i][j] != NULL) {
grid[i][j] = NULL;
}
}
}
}
void Garden::Display() {
for (int i = 0; i < Gardensize; i++) {
for (int j = 0; j < Gardensize; j++) {
if (grid[i][j].getType == antType) {
cout << antchar;
}
else if (grid[i][j].getType == NULL) {
cout << ".";
}
else if (grid[i][j].getType == doodleType) {
cout << bugchar;
}
}
cout << endl;
}
}
int Garden::checkType(int x, int y) {
return grid[x][y].getType();
}
class Organism {
friend class Garden;
public:
virtual int getType() {}; //
virtual void breed() {};
virtual bool starve() {};
virtual int move( int &breedtoken) {};
protected:
int x = -1; //initial xy place
int y = -1;
Garden garden;
bool moved; //used to define whether org has moved or not
int breedtoken = 0; //used to define whether org need to breed
};
class Ant : public Organism {
public:
Ant() {}; //
Ant(int x, int y, Garden* g)//initial a ant object by define the xy place in the gardene
{
this->x = x;
this->y = y;
garden = *g;
}
~Ant() {};
virtual int getType() {
return antType;
}
virtual int move(int &breedtoken);
virtual void breed() {};
virtual bool starve() { return false; };// ant wont starve
};
int Ant::move(int& breedtoken) {
int dir = rand() % 4;// randomly select direction
switch (dir) {
case 0 :// 0move upwards
if( this->x > 0 && garden.grid[x - 1][y] == NULL ){
garden.grid[x-1][y] = garden.grid[x][y];
garden.grid[x][y] = NULL;
x--;
}
break;
case 1:// 1 move downwards
if (this->x < Gardensize - 1 && garden.grid[x + 1][y] == NULL) {
garden.grid[x + 1][y] = garden.grid[x][y];
garden.grid[x][y] = NULL;
x++;
}
break;
case 2: // 2 move leftwards
if (this->y > 0 && garden.grid[x][y-1] == NULL) {
garden.grid[x][y-1] = garden.grid[x][y];
garden.grid[x][y] = NULL;
y--;
}
break;
case 3: // 3 move to right
if (this->y < Gardensize- 1 && garden.grid[x][y + 1] == NULL) {
garden.grid[x][y + 1] = garden.grid[x][y];
garden.grid[x][y] = NULL;
y++;
}
break;
this->breedtoken += 1;
return breedtoken;
}
}
class Doodlebug :public Organism {
public:
Doodlebug() {};
Doodlebug(int x, int y, Garden* g)
{
this->x = x;
this->y = y;
garden = *g;
}
virtual int getType() {
return doodleType;
}
};
int main()
{
srand(time(NULL));//
Garden garden;
int antCount = 0; //Ant counter, used to intilize 100 ants
int DoodleCount = 0;
Ant antarray[initialants];
Doodlebug doodlebugarray[initialdoodlebug];
while (antCount < initialants) {
int x = rand() % Gardensize;
int y = rand() % Gardensize;
if (garden.checkType(x, y) == NULL) {
antarray[antCount] = Ant(x, y, &garden); //initilize 100 ants
antCount++;
}
}
while (DoodleCount < initialdoodlebug) {
int x = rand() % Gardensize;
int y = rand() % Gardensize;
if (garden.checkType(x, y) == NULL) {
doodlebugarray[DoodleCount] = Doodlebug(x, y, &garden); //用数组的模式创建100只蚂蚁
DoodleCount++;
}
}
garden.Display();//display
}
The project is not finished yet. Right now, the code can initialize 100ants and 5 bugs. It can run properly but keep showing"subscript requires array or pointer " wherever I write grid[i][j] in the for loop. and " 'Garden::grid' uses undefined class 'Organism'" when I define the "Organism grid[][]" in the Garden class. I wonder to know how can i fix these 2 errors, and what's wrong with my 2d array grid?
