Question

main cpp file:

#include <iostream>
#include <cstdio>

#include "table.h"

using namespace std;

int main() {

    Table test;

    int i;
    for(i = 0; i < 26; i++) {
        cout << test.start[2] << endl;
    }

    system("PAUSE");
    return 0;
}

header file:

#pragma once


class Table {
    public:
        char start[26];

        Table();
        Table(char key[26]);

        ~Table();
};

cpp file:

#include "table.h"


Table::Table() {
    char start[26] = "ABCDEFGHIJKLMNOPRSTUVWXYZ";
}

Table::Table(char key[26]) {

}

errors im getting :

1>playfair.obj : error LNK2019: unresolved external symbol "public: __thiscall Table::~Table(void)" (??1Table@@QAE@XZ) referenced in function _main

1>c:\Users\Jansu\Documents\Visual Studio 2010\Projects\playfair\Debug\playfair.exe : fatal error LNK1120: 1 unresolved externals

so basically i googled a lot and do not know what to do. i found some answers but i tried them and did not help

for example i tried to add additional dependencies, but i had all of them already added.

help me please, why does the error come?

Answer 1

Although the header defines Table as having a dtor, the cpp file only contains a couple of constructors — not a destructor. Given that there seems to be nothing for your destructor to do (you haven’t allocated any dynamic memory or anything like that) you probably just want to remove the declaration of Table::~Table(); and be done with it. While you’re at it, you probably want to make Table::start private. I’d also change the parameter to a char const * instead of using array notation:

class Table {
        char start[26];
    public:
        Table();
        Table(char const *key);
};

Once you’re done dealing with that, you’ll need to deal with the fact that Table::Table() defines a local variable named start, and initializes it, but leaves Table::start uninitialized, which I doubt is what you wanted/intended.