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"undefined reference to" statement

roovraven (11)
Hello, I'm doing exercises on classes in c++ and I'm writing a program that should store and convert Roman numbers in decimal numbers. I'm compiling with code::blocks

This is RomanType.h 
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#ifndef ROMANTYPE_H
#define ROMANTYPE_H

const int SIZE = 15;


class RomanType
{
    public:
        void getrom(char str[]);             // store roman number
        int getnum(char str[]);              //convert in decimal form and store it
        void print() const;
        RomanType();
        RomanType(char str[]);

    protected:
    private:
        char rom[SIZE];
        int num;
};

#endif // ROMANTYPE_H


RomanType.cpp

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#include "RomanType.h"
#include <cstring>
#include <iostream>

RomanType::RomanType()
{
   for(int i=0; i<SIZE; i++)
        rom[i] = '\0'; //ctor
   num = 0;
}

RomanType::RomanType(char str[])
{
    strcpy(rom, str);
    num = 0;
}

void RomanType::getrom(char str[])
{
    strcpy(rom, str);
}

int RomanType::getnum(char str[])
{
    for(int i=0; i<SIZE; i++)
    {
        switch (rom[i])
        {
            case 'M':
            num =+ 1000;
            break;
            case 'D':
            num =+ 500;
            break;
            case 'C':
            num =+ 100;
            break;
            case 'L':
            num =+ 50;
            break;
            case 'X':
            num =+ 10;
            break;
            case 'V':
            num =+ 5;
            break;
            case 'I':
            num =+ 1;
            break;
            default:
            cout << "Invalid input";
            break;
        }

    }

void RomanType::print() const
{
    cout << num;
    cout << rom;
}
}


and finally main 
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#include <iostream>
#include <cstring>
#include "RomanType.h"

using namespace std;

int main()
{
    char str[SIZE];
    int dec;
    RomanType myrom;

    cout << "Enter a number in roman form:";
    cin >> str;

    myrom.getrom(str);

    myrom.print();

    return 0;
}



This is my debug window referring to main function

||=== numeri, Debug ===|
obj\Debug\main.o||In function `main':|
D:\programmic++\numeri\main.cpp|11|undefined reference to `RomanType::RomanType()'|
D:\programmic++\numeri\main.cpp|16|undefined reference to `RomanType::getrom(char*)'|
D:\programmic++\numeri\main.cpp|18|undefined reference to `RomanType::print() const'|
||=== Build finished: 3 errors, 0 warnings ===|


I can't see what's wrong in my code.
vlad from moscow (6539)
I see only that one function is defined inside another function

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int RomanType::getnum(char str[])
{
    for(int i=0; i<SIZE; i++)
    {
        switch (rom[i])
        {
            case 'M':
            num =+ 1000;
            break;
            case 'D':
            num =+ 500;
            break;
            case 'C':
            num =+ 100;
            break;
            case 'L':
            num =+ 50;
            break;
            case 'X':
            num =+ 10;
            break;
            case 'V':
            num =+ 5;
            break;
            case 'I':
            num =+ 1;
            break;
            default:
            cout << "Invalid input";
            break;
        }

    }

void RomanType::print() const
{
    cout << num;
    cout << rom;
}  
}// <== is it a typo?


It it is a typo then it looks like that object file of RomanType.cpp was not included in the project.
Last edited on
roovraven (11)
Yes, it was a typo. I corrected the code with your hints but it still doesn't work (same error statements).
cire (8284)
Undefined reference means the linker couldn't find the implementation of those functions. Make sure RomanType.cpp is being compiled and linked by your toolchain. (If you're using an IDE, make sure it's included in the project.)
roovraven (11)
Thanks a lot! I linked it properly and now it works!
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