Having issues fixing these issues: error LNK2019: unresolved external symbol "public: __thiscall grid::grid(void)" (??0grid@@QAE@XZ) referenced in function "void __cdecl `dynamic initializer for 'GridObject''(void)" (??__EGridObject@@YAXXZ) F:\Dev103\thermonuclear war game\thermonuclear war game\Grid.obj
error LNK1120: 1 unresolved externals F:\Dev103\thermonuclear war game\Debug\thermonuclear war game.exe 1
//header file
#include <iostream>
using namespace std;
class grid{
int r, c;
public:
grid();
void GridFunction();
int getR(){return r;}
int getC(){return c;}
void setR(int a){a = r;}
void setC(int b){b = c;}
};
//create object
extern grid GridObject; //has something to do with this, when commented out fixes that error but rest of my program has issues.
//cpp file
#include <iostream>
#include "Grid.h"
#include "Cities.h"
using namespace std;
grid GridObject;//has something to do with this
void grid::GridFunction(){
//randomly generate grid size
//set rows
GridObject.setR(rand()%16+7);
//set columns
GridObject.setC(rand()%16+7);
//display x co-ordinates
for(int i=0;i <=GridObject.getC(); i++){
cout << " " << i << " ";
}
int counter = 0;
for(int s=1;s< GridObject.getC()*GridObject.getR();s++){
cout << "+--+";
if(!(s % GridObject.getC())){
cout << endl;
for(int s=0;s<GridObject.getC();s++){
cout << "| << CityObject.getX() CityObject.getY()<< |";
}
}
if(!(s%GridObject.getC())){
//generate x co-ordinates
counter++;
cout <<" "<<counter;
cout << endl;
}
}
}
It has more to the program but the error is in this part. Any help will be highly appreciated.