#include <stdio.h"
#include <conio.h>
/* Press Esc to quit */
#define ESC 27
int main()
{
    int ch;
    while ((ch=getch()) != ESC)
    {
        printf("%d",ch);
        while (kbhit())
        {
            printf(" %d",getch());
        }
        printf("\n");
    }
    printf("ESC %d\n",ch);
    return 0;
}

#include <stdio.h>
#include <conio.h>
 
int main(void)
{
  unsigned char key, key2;
 
  while( (key=getch()) != '\r' )
  {
    if (key == 0)
    {
      key2 = getch();
      switch(key2)
      {
        case 72:
          printf("up "); break;
        case 75:
          printf("left "); break;
        case 77:
          printf("right "); break;
        case 80:
          printf("down "); break;
        default: break;
      }
    }
  }
  return 0;
}

c2 = 0;            // reset c2 to 'nothing'
c1 = getch();      // wait for a key
if (c1 == 0)       // check if it's a function key
{
    c2 = getch();  // it is, get the function value
}
//  if c2 is not 0, a function key was pressed

if (kbhit())        // check to see if a key was pressed
{                   // a key was pressed so we interrupt the standard 
                    //     programming cycle
    c2 = 0;         // reset c2 to 'nothing'
    c1 = getch();
    if (c1 == 0)
    {
        c2 = getch();
    }
    //  if c2 is not 0, a function key was pressed
    ...
}