C++

Forum

 
Help with undeclared identifier

aanewman (1)
I have to make a connect four game. When i am trying to declare the board, which has to be a 6x7 string matrix, i get that it is undeclared. Please any help is welcome. There are also two other files, another header and cpp file that i am not including. 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
 
#ifndef BOARD_H
#define BOARD_H

#include <iostream>
#include <string>
#include <iomanip>
   
    using std::string;
    using std::ostream;
	using std::endl;
   
   const int rows = 6;
   const int cols = 7;
   const int diags = 24;
 class Board
   {
   private:
       string board[rows][cols];
       int checkerCount;
       bool checkRow( int row );
       bool checkCol( int col );
       bool checkDiag( int dia );//there are 18 locations where you can make a diagonal.  This number represents one of them.  I have numbered them from the top left starting with 0
   public:
       Board();
       bool win();
       bool draw();
       bool dropChecker( string checker, int icol );
       bool gameOver();
       void displayBoard( ostream& out );
       void resetBoard();
   };
   
   #endif


//////NOW THIS IS A SEPARATE FILE

#include "Board.h"
#include <iomanip>

using namespace std;
using std::string;

Board::Board()
{
	int checkerCount=0;
	for (int i=0; i<rows; i++)
		{
			for (int j=0; j<cols; j++)
			{
            board[i][j]= "";
			}
    }
}
bool checkCol( int col )
{
	if ((board[0][col]== board[1][col]) && (board[1][col] == board[2][col]) && (board[2][col] == board[3][col]) && !(board[0][col] == ""))
	{
		return true;
	}
	else if ((board[1][col]== board[2][col]) && (board[2][col] == board[3][col]) && (board[3][col] == board[4][col]) && !(board[1][col] == ""))
	{
		return true;
	}
	else if ((board[2][col]== board[3][col]) && (board[3][col] == board[4][col]) && (board[4][col] == board[5][col]) && !(board[2][col] == ""))
	{
		return true;
	}
	else
	{
		return false;
	}
}
bool Board::checkRow( int row)
{
	
	if ((board[row][0]== board[row][1]) && (board[row][1] == board[row][2]) && (board[row][2] == board[row][3]) && !(board[row][0] == ""))
	{
		return true;
	}
	else if ((board[row][1]== board[row][2]) && (board[row][2] == board[row][3]) && (board[row][3] == board[row][4]) && !(board[row][1] == ""))
	{
		return true;
	}
	else if ((board[row][2]== board[row][3]) && (board[row][3] == board[row][4]) && (board[row][4] == board[row][5]) && !(board[row][2] == ""))
	{
		return true;
	}
	else if ((board[row][3]== board[row][4]) && (board[row][4] == board[row][5]) && (board[row][5] == board[row][6]) && !(board[row][3] == ""))
	{
		return true;
	}
	else
	{
		return false;
	}	
}
bool Board::checkDiag( int dia)
{
	if ((board[0][0]== board[1][1]) && (board[1][1] == board[2][2]) && (board[2][2] == board[3][3]) && !(board[0][0] == ""))
	{
		return true;
	}
	else if ((board[0][1]== board[1][2]) && (board[1][2] == board[2][3]) && (board[2][3] == board[3][4]) && !(board[0][1] == ""))
	{
		return true;
	}
	else if ((board[0][2]== board[1][3]) && (board[1][3] == board[2][4]) && (board[2][4] == board[3][5]) && !(board[0][2] == ""))
	{
		return true;
	}
	else if ((board[0][3]== board[1][4]) && (board[1][4] == board[2][5]) && (board[2][5] == board[3][6]) && !(board[0][3] == ""))
	{
		return true;
	}
	else if ((board[1][0]== board[2][1]) && (board[2][1] == board[3][2]) && (board[3][2] == board[4][3]) && !(board[1][0] == ""))
	{
		return true;
	}
	else if ((board[1][1]== board[2][2]) && (board[2][2] == board[3][3]) && (board[3][3] == board[4][4]) && !(board[1][1] == ""))
	{
		return true;
	}
	else if ((board[1][2]== board[2][3]) && (board[2][3] == board[3][4]) && (board[3][4] == board[4][5]) && !(board[1][2] == ""))
	{
		return true;
	}
	else if ((board[1][3]== board[2][4]) && (board[2][4] == board[3][5]) && (board[3][5] == board[4][6]) && !(board[1][3] == ""))
	{
		return true;
	}
	else if ((board[0][6]== board[1][5]) && (board[1][5] == board[2][4]) && (board[2][4] == board[3][3]) && !(board[0][6] == ""))
	{
		return true;
	}
	else if ((board[0][5]== board[1][4]) && (board[1][4] == board[2][3]) && (board[2][3] == board[3][2]) && !(board[0][5] == ""))
	{
		return true;
	}
	else if ((board[0][4]== board[1][3]) && (board[1][3] == board[2][2]) && (board[2][2] == board[3][1]) && !(board[0][4] == ""))
	{
		return true;
	}
	else if ((board[0][3]== board[1][2]) && (board[1][2] == board[2][1]) && (board[2][1] == board[3][0]) && !(board[0][3] == ""))
	{
		return true;
	}
	else if ((board[1][6]== board[2][5]) && (board[2][5] == board[3][4]) && (board[3][4] == board[4][3]) && !(board[1][6] == ""))
	{
		return true;
	}
	else if ((board[1][5]== board[2][4]) && (board[2][4] == board[3][3]) && (board[3][3] == board[4][2]) && !(board[1][5] == ""))
	{
		return true;
	}
	else if ((board[1][4]== board[2][3]) && (board[2][3] == board[3][2]) && (board[3][2] == board[4][1]) && !(board[1][4] == ""))
	{
		return true;
	}
	else if ((board[1][3]== board[2][2]) && (board[2][2] == board[3][1]) && (board[3][1] == board[4][0]) && !(board[1][3] == ""))
	{
		return true;
	}
	else if ((board[1][6]== board[2][5]) && (board[2][5] == board[3][4]) && (board[3][4] == board[4][3]) && !(board[1][3] == ""))
	{
		return true;
	}
	else if ((board[0][6]== board[1][5]) && (board[1][5] == board[2][4]) && (board[2][4] == board[3][3]) && !(board[0][6] == ""))
	{
		return true;
	}
	else if ((board[2][6]== board[3][5]) && (board[3][5] == board[4][4]) && (board[4][4] == board[5][3]) && !(board[2][6] == ""))
	{
		return true;
	}
	else if ((board[0][3]== board[1][4]) && (board[1][4] == board[2][5]) && (board[2][5] == board[3][6]) && !(board[0][3] == ""))
	{
		return true;
	}
	else if ((board[1][3]== board[2][4]) && (board[2][4] == board[3][5]) && (board[3][5] == board[4][6]) && !(board[1][3] == ""))
	{
		return true;
	}
	else if ((board[2][3]== board[3][4]) && (board[3][4] == board[4][5]) && (board[4][5] == board[5][6]) && !(board[2][3] == ""))
	{
		return true;
	}
	else
		return false;
}
bool Board::dropChecker( string checker, int column)
{
	if (column-1>=0 && column-1<8)
	{
		for (int i = 5; i>=0; i--)
		{
				if (board[i][column-1]== "")
			{
				board[i][column-1]= checker;
				checkerCount++;
				return true;
			}
		}
	}

	else
		return false;
}
bool Board::gameOver()
{
	if ( win() || draw() )
	{
		return true;
	}
	return false;
}
bool Board::draw()
{
	if (checkerCount== 42 )
	{
		return !win();
	}
	else
		return false;
}
bool Board::win()
{
	for (int i=0; i<5; i++)
	{
		if (checkRow(i))
		{
			return true;
		}
		
	}
	for (int j=0; j<6; j++)
	{
		if (checkCol(j))
		{
			return true;
		}
	}

	if (checkDiag(0))
		return true;
	
	return false;

}

void Board::displayBoard (ostream& out)
{
	out << "---------------" << endl;
	for ( int i=0; i< rows; i++)
	{
		for ( int j=0; j < cols; j++)
		{
			out << "|" <<  board[i][j];
		}
		out << "|" << endl;
		out << "---------------" << endl;
	}
}
void Board::resetBoard()
{
	for (int i= 0; i<5;i++)
	{
		for (int j=0; j<6; j++)
		{
				board[i][j]== "";
		}
	}
	checkerCount=0;
}

the error message i get is
.\Board.cpp(20) : error C2065: 'board' : undeclared identifier
.\Board.cpp(24) : error C2065: 'board' : undeclared identifier
.\Board.cpp(28) : error C2065: 'board' : undeclared identifier

please any help will help, im a beginner by far.
Lodger (128)
You are missing a class qualifier from bool checkCol(int col)

Like so:

1
2
3
4
 
bool Board::checkCol( int col )
{
	// Removed for brevity.
}


Edit: I have only skimmed through the rest of your code, nothing else jumped out at me but if you're still struggling, just shout :-)
Last edited on
Codermik (835)
You'll need to check the dropChecker function alongside making the changes Lodger suggested as not all control paths return a value.

For example, if if (column - 1 >= 0 && column - 1<8) is not true your function returns false, but what happens when its false and you enter your for..loop code - if the if (board[i][column - 1] == "") is not true then return true; will not be reached and the for..loop will simply exit.

Remove the "else" from the return false; at the end of the function.. 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
 

bool Board::dropChecker(string checker, int column)
{
	if (column - 1 >= 0 && column - 1<8)
	{
		for (int i = 5; i >= 0; i--)
		{
			if (board[i][column - 1] == "")
			{
				board[i][column - 1] = checker;
				checkerCount++;
				return true;
			}
		}
	}
	return false;
}

Topic archived. No new replies allowed.