32-bit signed binary integer with extern "COBOL"

IDENTIFICATION DIVISION.
PROGRAM-ID. COBRTN.
ENVIRONMENT DIVISION.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 X PIC S9(9) BINARY.
01 Y PIC S9(9) BINARY.
PROCEDURE DIVISION.
     MOVE 1 TO X.
     MOVE 2 TO Y.
* X BY VALUE, Y BY REFERENCE ***
     CALL "CENTRY" USING BY CONTENT X
       BY REFERENCE Y.
     GOBACK.
END PROGRAM COBRTN.

#include <stdio.h>
extern "COBOL" {void CENTRY (int x, int *y);}

void CENTRY(int x, int *y)
{
  printf("%d %d \n",x,*y);
  return;
}