#include "stdlib.h"
#include "stdio.h"

int main()
{
    FILE *fd;
    int rank, a[2], b[2];
    char message[64];

    printf("Enter rank (0 or 1):\n");
    scanf("%d", &rank);
    
    if ( rank == 0 )
    {
	fd = fopen("message_file","w");
	fprintf(fd,"this is the message\n");
    }
    else
    {
	fd = fopen("message_file","r");
	fscanf(fd,"%s", message);
	printf("I read %s\n", message);
    }
    close(fd);

    if ( rank == 0 ) 
	a[0] = 27;
    else
	a[1] = 31;
    
    printf("a:  %d  %d\n", a[0], a[1]);

    b[rank] = rank+2;
	
    printf("b:  %d  %d\n", b[0], b[1]);
}