C++

Forum

 
function call for 2d array

firescorpian99 (4)
I am working on a project dealing with a 2d array. I am getting the following error at my function calls: "undefined reference to `studentAverage(int (*) [3], int)'" I have tried adjusting the arguments for my function call, to no avail. I have tried googling and searching various forums, which ended up making me more confused. I would really appreciate any help. Thanks in advance!

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
 

#include <iostream>
#include <iomanip>
#include <fstream>

		// global variables
const int ROW = 5, CLM = 3;



using namespace std;

// function prototypes
void testAverage(int table[][CLM], int);			// average score for each test
void studentAverage(int table[][CLM], int);		// average score for each student
void bestScore(int table[][CLM], int);			// best score for each test
void numberOfA(int table[][CLM], int);			// number of a scores for each student


int main()
{

	int table[ROW][CLM];
	int row;
	ifstream inputFile;


	inputFile.open("p6.dat");			// open file

	for (int rowNum = 0; rowNum < ROW; rowNum++)				// read info from file
	{
		for (int clmNum = 0; clmNum < CLM; clmNum++)
		{
			inputFile >> table[rowNum][clmNum];
		}

	}

	inputFile.close();					// close file
	for(int row = 0; row < ROW; row++)
	{

		for (int col = 0; col < CLM; col++)
			cout << table[row][col] << endl;
	}



	studentAverage(table, row);

	testAverage (table, row);

	bestScore (table, row);

	numberOfA (table, row);


	return 0;
}




void studentAverage(const int scores[][CLM], int row)
{
	double average, total = 0;
	int col;

	for(int row = 0; row < ROW; row++)
	{

		for (col = 0; col < CLM; col++)
			total += scores[row][col];
		average = total / CLM;

		cout << showpoint << setprecision(2) << fixed;
		cout << "The average score for student " << (row + 1) << " is " << average << endl;
	}
}


void testAverage(const int scores[][CLM], int row)
{
	double average, total = 0;
	int col;

	for (col = 0; col < CLM; col++)
	{
		for (int row = 0; row < ROW; row++)
			total += scores[row][col];
		average = total / ROW;
	}
	cout << showpoint << setprecision(2) << fixed;
			cout << "The average score for test " << (col + 1) << " is " << average << endl;
}


void bestScoreStudent(const int scores[][CLM], int row)
{
	int highest, col;

	highest = scores[0][0];
	for(int row = 0; row < ROW; row++)
		{
			for (col = 0; col < CLM; col++)
			{
				if (scores [row][col] > highest)
					highest = scores[row][col];
			}
		}
	cout << "The highest test score is " << highest << endl;
}


void numberOfA(const int scores[][CLM], int row)
{
	const int ACE = 90;
	int numOfA = 0, col;

	for(int row = 0; row < ROW; row++)
		{
			for (col = 0; col < CLM; col++)
			{
				if (scores [row][col] > ACE)
					numOfA++;
			}
		}
	cout << "The number of A grades is " << numOfA << endl;
}
jlb (4973)
Do you know that the const qualifier "modifies" the parameter? You have a function prototype of:

 
 
void studentAverage(int table[][CLM], int);


and a function implementation of:

 
 
void studentAverage(const int scores[][CLM], int row)


Notice the difference? This means that the prototype is different from the implementation, and they must be the same. This is one of the reasons that many programmers recommend that the prototype be identical to the implementation (including all qualifiers and the parameter names).

firescorpian99 (4)
Thank you so much, i new it had to be something simple that i was overlooking. that eliminated the error.
Topic archived. No new replies allowed.