This works on Turbo C++ I wonder why it doesn't work here

Question

#include<stdio.h>
#include<conio.h>
#include<dos.h>

main()
{clrscr();
int cx_gbm;
printf(\"NEW YEARS COUNTDOWN\n");
cx_gbm=10;

do
{printf ("%d\n", cx_gbm);
cx_gbm--; delay (200);}
while (cx_gbm>=0);

for (int x_gbm=7;x_gbm>=0;x_gbm--)
{printf ("\boomBoomBoom\n");
delay(100);}

the output says 

main.c:3:9: fatal error: dos.h: No such file or directory
    3 | #include<dos.h>
      |         ^~~~~~~
compilation terminated.

Answer 1

It doesn't work because they are different programs that are why and because of that.

Answer 2

You just posted the answer yourself: the "dos.h" include does not exist. OnlineGBD is hosted on a Linux machine, hence this header is not available. So clrscr() and delay() are not recognized commands.

You can wait with the sleep() command instead. You provide the number of seconds to wait.

system("clear") could be used to clear the console.

The below could work fine on OnlineGDB (and any Linux):

#include<stdio.h>
#include<unistd.h>

int main()
{
    system("clear");
    printf("NEW YEARS COUNTDOWN\n");
    
    for (int countdown = 10; countdown >= 0; countdown--)
    {
        printf("%d\n", cx_gbm);
        sleep(1);
    }

    for (int countdown = 7; countdown >= 0; countdown--)
    {
        printf("BoomBoomBoom\n");
        sleep(1);
    }
    return 0;
}