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Asked: 2026-06-03T00:48:26+00:00

1>knightTour_Main.obj : error LNK2005: int p (?p@@3HA) already defined in Definitions.obj 1>knightTour_Main.obj : error

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1>knightTour_Main.obj : error LNK2005: "int p" (?p@@3HA) already defined in Definitions.obj
1>knightTour_Main.obj : error LNK2005: "int q" (?q@@3HA) already defined in Definitions.obj

Error^

This is the code where I’ve defined it in a header file:

#include<iostream>
using namespace std;
int p,q;

int f( int,  int,const int [][8],const int [][8], int [],int []);

I’ve tried 

extern int p,q;

But I get this error after that

1>knightTour_Main.obj : error LNK2001: unresolved external symbol "int p" (?p@@3HA)
1>knightTour_Main.obj : error LNK2001: unresolved external symbol "int q" (?q@@3HA)

Do you recommend anything else? Thank you.

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1 Answer

  1. Editorial Team

    Replacing the int p,q; with extern int p,q; was correct, but you also need to include int p,q; in exactly one .cpp file

    If you have a definition (int p,q;) in a header, then you’ll get one copy of p and q allocated for each file that includes that header, and they conflict (the “already defined” error). If you replace it with a declaration (extern int p,q;), you don’t get p or q allocated anywhere.

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