using wait() to prevent children from zombiefying

basic_parent_child_wait.c

/* Using 'wait();' and an '__EXIT_STATUS' makes sure we don't have zombies or a race condition */ 
#include  <stdio.h>
#include  <sys/types.h>
#include  <sys/wait.h>
#include  <signal.h>
void  child(int*);
int  parent(int);
int  main(void)
{
	pid_t  pid=1;
	int n=0;
	do {
		if (pid == 0) 
			child(&n);
		else 
			n = parent(pid);
		pid = fork();
	}while(n!=0);
}
void  child(int* n) {
	printf("\t\t\t\t Child --> %d\n",getpid());
	printf("KID]\tgot %d\n", *n);
	printf("KID]\tsay %d + 2 = %d\n", *n, *n+2);
	*n+=2;
	kill(getpid(),SIGKILL); //child kills itself (becomes a zombie)
}
int  parent(int child_pid) {
	int n, status;
	
	wait(&status); /*removes zombies*/
	WEXITSTATUS(status); 

	printf("PARENT] enter a #  \t\t 0 to End\n");
	scanf("%d",&n);
	return n;
}