Running a function type of program when the C header file is in a flashdrive?

Question

Im currently working on C, and would like to know if its possible to run a program when a user made header file is in a flashdrive. It works if the file is on a PC, but not sure if it would if its external.

The code looks something like this:

#include <stdio.h>
#include<Conio.h>
#include"headerfilewhichcontainsintcheck.h"
void main(){
int a,g,c;    
printf("Input age: ");
scanf("%d", &a);
printf("Input gender: ");
scanf("%d", &g);
c=check(a,g)//the function which will process the variables below, which is, contained in the header file//
getch();
}

Again, it runs when the header file is in the PC, but ceases to when its on a flashdrive. Is there something Im missing here? Much appreciated!

Answer 1

As it turns out all I had to do was to open the DOSBOX and mount the directory, or set path.

mount b: e:\

Anyways thanks for helping I appreciated all of your help...!