#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

int number1 = 5;
int number2 = -5;

int main() {
pid_t pid;
int temp;
pid = fork();
if (pid == 0) {
/* child process */
temp = number1;
number1 = number2;
number2 = temp;
printf(“CHILD: number1 = %d”, number1);
}
else if (pid != 0) {
/* parent process */
wait (NULL);
printf(“PARENT: number1 = %d”, number1);
exit(0);
}
}