#include<stdio.h>

#include<stdlib.h>

#include<unistd.h>

#include<sys/ipc.h>

#include<sys/types.h>

int main()

{

int p1[2],p2[2],i;

char buf[5];

pipe(p1);

pipe(p2);

if(fork()==0)

{

printf("n this is child(the input text is text)n");

close(p1[0]);

close(p2[1]);

write(p1[1],"text",5);

read(p2[0],buf,5);

write(1,buf,5);

}

else

{

printf("n this is parent(the output text is text)n");

close(p2[0]);

close(p1[1]);

read(p1[0],buf,5)

for(i=0;i<4;i++)

buf[i]=to upper(buf[i]);

write(p2[1],buf,5)

}

}