Having trouble with pipe / fork. Can't understand half of the manual (man)
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
void main () {
    int a[] = {1,2,3,4}, f[2];  // ok so we initialize an array and a "pipe folder" (pipefd in manual) ?
    pipe (f);                   // not 100% sure what this does ?
    if (fork () == 0) {         // if child
        close (f[0]);               // close pipe read-end
        a[0] += a[1];
        write (f[1], &a[0], sizeof (int))      // fixed
        close (f[1]);               // close pipe write-end
        exit(0);                    // closes child and sends status update to parent ?
    }
    else {                          // if parent
        close (f[1])                // close write-end of pipe
        a[2]+=a[3];
        read (f[0], &a, sizeof(int))          // fixed
        wait (0);                   // waits for child to ... close ? or just finish ? or is it the same thing
        a[0]+= a[2]; close (f[0]);
        printf ("%dn, "a[0]);
   }
}