Error : undefined reference to

[gdarian216]

im getting an error and I dont know why can anyone help.

this is the error......

/tmp/ccxaenRY.o(.text+0x375): In function `main':
: undefined reference to `average_quizes(records, float&)'
collect2: ld returned 1 exit status

#include <cstdlib>
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
using namespace std;
 
ifstream in_file;
//class that holds student record information.
class records{
private:
string name;
float quizes[7];
float projects[6];
float exams[2];
float labs[14];
public:
void set_name(ifstream& in_file);
void set_quizes(ifstream& in_file);
void set_projects(ifstream& in_file);
void set_exams(ifstream& in_file);
void set_labs(ifstream& in_file);
float get_quizes(int val);
//float get_projects(int val);
//float get_exams(int val);
//float get_labs(int val);
 
 
};
 
 
void average_quizes(records,float&);
 
int main()
{
 
 
cout.width(10);
cout << "No." << " " << "Name" <<" " << " " << " Quiz" << " " << "Project" << " " << "Exam" << " " << "Lab" << " " << "Total" << " " << "Grade" << endl;
cout << "---------------------------------------------------------------" << endl;
cout << endl;
 
 
 
records grades;
ifstream in_file;// Define a file input stream and open the file
in_file.open("record.txt"); //opening file
 
if (in_file.fail())
{
// Failed to open the file (file doesn't exist or isn't readable)
cout << "Could not open file: "<< "\n";
exit(1);
}
 
 
int counter = 1;
float quiz_average = 0;
 
while(in_file)
{
average_quizes(grades,quiz_average);
cout << quiz_average;
cout << counter;
}
 
return 0;
 
}
void records::set_name(ifstream& in_file)
{
in_file >> name;
}
void records::set_quizes(ifstream& in_file)
{
 
for (int i = 0; i < 7; i++)
{
in_file >> quizes[i];
}
}
void records::set_projects(ifstream& in_file)
{
for (int i = 0; i < 6; i++)
{
in_file >> projects[i];
}
}
void records::set_exams(ifstream& in_file)
{
for (int i = 0; i < 2; i++)
{
in_file >> exams[i];
}
}
void records::set_labs(ifstream& in_file)
{
for (int i = 0; i < 14; i++)
{
in_file >> labs[i];
}
}
//accessing quiz values.
float records::get_quizes(int val)
{
 
if(val < 7)
return quizes[val];
else
return quizes[0];
 
}
//printing out quizes.
void average_quizes(records* obj,float& quiz_average)
{
for (int i = 0; i < 7; i++)
{
obj-> get_quizes(i);
quiz_average = i + quiz_average;
quiz_average = (quiz_average/7);
}
}

[ilikepython]

im getting an error and I dont know why can anyone help.

this is the error......

/tmp/ccxaenRY.o(.text+0x375): In function `main':
: undefined reference to `average_quizes(records, float&)'
collect2: ld returned 1 exit status

#include <cstdlib>
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
using namespace std;
 
ifstream in_file;
//class that holds student record information.
class records{
     private:
        string name;
        float quizes[7];
        float projects[6];
        float exams[2];
        float labs[14];
     public:
        void set_name(ifstream& in_file);
        void set_quizes(ifstream& in_file);
        void set_projects(ifstream& in_file);
        void set_exams(ifstream& in_file);
        void set_labs(ifstream& in_file);
        float get_quizes(int val);
        //float get_projects(int val);
        //float get_exams(int val);
        //float get_labs(int val);
 
 
};
 
 
void average_quizes(records,float&);
 
int main()
{
 
 
    cout.width(10);
    cout << "No." << "  " << "Name" <<"  " << "  " << " Quiz" << "  " << "Project" << "  " << "Exam" << "  " << "Lab" << "  " << "Total" << "  " << "Grade" << endl;
    cout << "---------------------------------------------------------------"         << endl;
    cout << endl;
 
 
 
        records grades;
        ifstream in_file;// Define a file input stream and open the file
        in_file.open("record.txt"); //opening file
 
        if (in_file.fail())
        {
        // Failed to open the file (file doesn't exist or isn't readable)
        cout << "Could not open file: "<< "\n";
        exit(1);
        }
 
 
        int counter = 1;
        float quiz_average = 0;
 
        while(in_file)
        {
        average_quizes(grades,quiz_average);
        cout << quiz_average;
        cout << counter;
        }
 
        return 0;
 
}
void records::set_name(ifstream& in_file)
{
        in_file >> name;
}
void records::set_quizes(ifstream& in_file)
{
 
        for (int i = 0; i < 7; i++)
        {
                in_file >> quizes[i];
        }
}
void records::set_projects(ifstream& in_file)
{
        for (int i = 0; i < 6; i++)
        {
                in_file >> projects[i];
        }
}
void records::set_exams(ifstream& in_file)
{
        for (int i = 0; i < 2; i++)
        {
                in_file >> exams[i];
        }
}
void records::set_labs(ifstream& in_file)
{
        for (int i = 0; i < 14; i++)
        {
                in_file >> labs[i];
        }
}
//accessing quiz values.
float records::get_quizes(int val)
{
 
        if(val < 7)
        return quizes[val];
        else
        return quizes[0];
 
}
//printing out quizes.
void average_quizes(records* obj,float& quiz_average)
{
        for (int i = 0; i < 7; i++)
        {
            obj-> get_quizes(i);
            quiz_average = i + quiz_average;
            quiz_average = (quiz_average/7);
        }
}

I think it is because your prototype is different from your declareation:

void average_quizes(records,float&);
void average_quizes(records* obj,float& quiz_average)

You ask for a pointer in one and an actual object in the other.
You can overload a function by the type of arguements are passed to it. So the compiler sees the function, but doesn't see the actual body. The one you gave it is not looked for because it takes a pointer. Try changing one of them and see what happens.

[gdarian216]

i changed that and now I got this


test.cpp: In function `int main()':
test.cpp:63: error: cannot convert `records' to `records*' for argument `1' to `void average_quizes( records*, float&)'

[ilikepython]

i changed that and now I got this


test.cpp: In function `int main()':
test.cpp:63: error: cannot convert `records' to `records*' for argument `1' to `void average_quizes( records*, float&)'

Ok, that means you are passing a "records" when you should pass a pointer to one. You can either pass a pointer or change the function to take an actual object instead of a pointer.

[gdarian216]

I thought I was passing a pointer. What did I do wrong

[ilikepython]

I thought I was passing a pointer. What did I do wrong

You weren't passing a pointer. Add an ampersand in front of the variable or make it a pointer. Do you know how to do that?

[gdarian216]

do u mean something like this

void get_score(recor ds&,float&)

but that would pass it by reference.

how would I make it a pointer?

[ilikepython]

do u mean something like this

void get_score(recor ds&,float&)

but that would pass it by reference.

how would I make it a pointer?

No, no. The way you are calling the function is the problem. You are passing in an object of "records" type. You need a pointer to the location of that object. To do that add an ampersand in front of the variable grades in your function call.
Like this:

average_quizes(&grades, quiz_average);
 

Post here if you are having problems.