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

int main() {
int n=rand()%1000;
int proces;
int p[2];int q[2];
pipe(p);pipe(q);
int a[2];
a[0]=n;
a[1]=1;
int ok=0;
printf("n initially is %d\n",a[0]);
proces=fork();
write(q[1],&a,2*sizeof(int));
if(proces==0){///in child
	while(a[0]>10){
		read(p[0],&a,2*sizeof(int));
		a[0]=a[0]-a[1];
		printf("in child %d n: %d\n",getpid(),a[0]);
		printf("subtracted: %d which is now ",a[1]);
		a[1]=a[1]*10;
		printf("%d \n",a[1]);
		write(q[1],&a,2*sizeof(int));

	}
	exit(0);
	}
else{ //in parent

	while(a[0]>10){
		read(q[0],&a,2*sizeof(int));
		ok=1;
		a[0]=a[0]-a[1];
		printf("in parent %d n: %d\n",getpid(),a[0]);
		printf("subtracted: %d which is now ",a[1]);
		a[1]=a[1]*10;
		printf("%d \n",a[1]);
		write(p[1],&a,2*sizeof(int));
	}

}
wait();
printf("Final number has reached: %d\n",a[0]);
close(p[1]);
close(p[0]);
close(q[1]);
close(q[0]);

return 0;