How can i run this?

Question

#include<iostream.h>
#include<conio.h>

int gvar=20;
void display();
class demo
{
public:
int i;
void show()
{
cout<<"inside the class demo"<<endl;
}
};
void main()
{
int p=10;
clrscr();
demo obj;
obj.i=40;
obj.show();
cout<<"local variable"<<p<<endl;
cout<<"global variable"<<gvar<<endl;
cout<<"class variable"<<obj.i<<endl;
}
void display()
{
cout<<"user defined function defination"<<endl;
getch();
}

Answer 1

Something like this can run in Sololearn's Code Playground.

#include <iostream>

using namespace std;

int gvar=20;
void display();

class demo
{
public:
int i;
void show()
{
cout<<"inside the class demo"<<endl;
}
};

int main()
{
int p=10;
demo obj;
obj.i=40;
obj.show();
cout<<"local variable"<<p<<endl;
cout<<"global variable"<<gvar<<endl;
cout<<"class variable"<<obj.i<<endl;
return 0;
}

void display()
{
cout<<"user defined function defination"<<endl;
}