game loop suport

[popa6200]

I want to have some varables that can be used throught functions using the extrn comand.
here is my code:
source code:

#include <cstdlib>
#include <iostream>
#include <fstream>
#include <time.h>
#include <stdlib.h> 
using namespace std;


void item (){}

void render (){
     int con;
     extern int var;
     
     const int c1 =1;
     if(var == c1){cout <<"hi";} 

}

void control () {}
      

int main(int argc, char *argv[])
{
     cout <<"   ____________________________________\n";
         cout <<" /                                    |\n";
         cout <<" |                                    |\n";
         cout <<" |                                    /\n";
         cout <<" |                                   /\n";
         cout <<" |                                  /\n";
         cout <<" |                                 |\n";
         cout <<" |=================================|\n";
         cout <<" |                                 |\n";
         cout <<" |                                  \\ \n";
         cout <<" |                                   \\ \n";
         cout <<" |                                    \\ \n";
         cout <<" |                                    |\n";
         cout <<" \\____________________________________|\n";
         system ("ping localhost -n 10 >nul");
         system("cls");
         
    loop:
    
    item (); //render items     
    render(); // render terain
    control(); //user input
    
    goto loop;}

  

data scource file:

#include <cstdlib>
#include <time.h>
#include <stdlib.h> 
#include <iostream>
using namespace std;
int main2 (void){
    srand(time(NULL));
    int var = rand() % 4 +1;
    
    string s1 ("`");
    string s2 ("`");
    string s3 ("`");
    string s4 ("`");
    string s5 ("`");
    string s6 ("`");
    string s7 ("`");
    string s8 ("`");
    string s9 ("`");}

my compiler is DevC++ and it spits out the errors:
[Linker error] undefined reference to `var'
ld returned 1 exit status
C:\Users\%blank%\Documents\%blank%\programs\games\7\Makefile.win [Build Error] [soul.exe] Error 1

[Zhuge]

You said there is to be a variable defined in the scope of the render() function, but haven't ever defined such a variable anywhere else. The one in main2() is local only to that function.

[Superdude]

Lines 42 - 48: Don't use goto, use a loop.

[TwilightSpectre]

Why are you including <cstdlib> and <stdlib.h>?

[popa6200]

so Zhuge should I take out int main2 (void)?