What are the Return Codes in C for the arrow keys?

Examine the code below on how to get the extended key codes:

int main(){
int a;

printf("Press escape to quit!\n\n");
while(1)
 {
 a = getch();                          /* Get key press and   */
 if (a == 0 ) { a = getch() + 0x100; } /* Add 256 if extended */
 switch ( a )
  {
  case 27:                           /* If escape key */
  printf( "Escape key. Exiting...\n" );
  return 0;
  case 328:                          /* If Up  Arrow key */
  printf("Up  Arrow key\n");
  break;
  case 336:                          /* If Down Arrow key */
  printf("Down Arrow key\n");
  break;
  case 333:                          /* If Right  Arrow key */
  printf("Right  Arrow key\n");
  break;
  case 331:                          /* If Left Arrow key */
  printf("Left Arrow key\n");
  break;
  default:
  printf("Key code is --> %d\n", a);
  }
 }
}


 
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