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

int main(void) {
    // Child will get idential COPY of this variable
    int x = 7;
    // fork creates 2 identical copies of program
    // only return value is different

    pid_t pid = fork();

    if (pid == -1) {
         perror("fork");  // print why the fork failed
    } else if (pid == 0) {
        printf("Child x was %d\n", x);
        x = 99;
        printf("Child x is %d\n", x);
    } else {
        printf("Parent x was %d\n", x);
        x = x/2;
        printf("Parent x is %d\n", x);
    }

    return 0;
}