fork and vfork

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>

#include <stdlib.h>



int global=5;



int main(void)

{

    pid_t pid;

    int var=1,i;

    printf("The difference between fork and vfork:\n");

    pid=vfork();

    switch(pid)

    {

    case 0:

    i=3;

    while(i-->0)

    {

    printf("Child process is running\n");

    global++;

    var++;

    }

    printf("Child End:global=%d,var=%d\n",global,var);

    break;

    case -1:

    perror("fork error:");

    exit(1);

    default:

    i=5;

    printf("%10d\n",var);

    while(i-->0)

    {

    printf("Parent process is running\n");

    global++;

    var++;

    }

    printf("Parent End:global=%d,var=%d\n",global,var);

    exit(0);

    }

}

The program running result as follows:

The difference between fork and vfork:
Child process is running
Child process is running
Child process is running
Child End:global=8,var=4
4359003
Parent process is running
Parent process is running
Parent process is running
Parent process is running
Parent process is running
Parent End:global=13,var=4359008


My question is: The value of 'var' is 4359003, why not 4 ?