#include<iostream>
#include <unistd.h>

using namespace std;

int main(){
    int pipefd[2];		// 0 = reading end, 1 = writing end
    char cbuf[20];
    char pbuf[20];

    pipe(pipefd);

    int a = fork();
    if(a == 0){
	cout << "reading end = " << pipefd[0] << endl;
	read(pipefd[0], cbuf, sizeof(cbuf));
	cout << "Child: " << cbuf << endl;
	write(pipefd[1], "And I am the child" , 18);
    } else {
	cout << "writing end = " << pipefd[1] << endl;
	write(pipefd[1], "I am your parent", 16);
	read(pipefd[0], pbuf, sizeof(pbuf));
	cout << "Parent: " << pbuf << endl;
    }
}