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C/C++ code:

int main(){
int channel[2]; //channel[0] for receive, channel[1] for send
int a,b,c,d;
int pipe(channel);
int i;

printf("I am the parent process! \n\n");
close(channel[0]);
a = 10;
sleep(2);
write(channel[1], a, sizeof(int));
close(channel[1]);

for(i = 0; i < 3; i++){
if(fork() == 0){
break;//´´½¨3¸ö×Ó½ø³Ì
}
}

if(i == 0){
printf("I am the first child! I will do the addition. \n");
close(channel[1]);
read(channel[0], a, sizeof(int));
close(channel[0]);
b = a + 10;
sleep(2);
close(channel[0]);
write(channel[1], b, sizeof(int));
close(channel[1]);
}

close(channel[1]);
read(channel[0], b, sizeof(int));
close(channel[0]);
printf("Data received. The result of addition is %d \n\n", b);

close(channel[0]);
write(channel[1], a, sizeof(int));
close(channel[1]);
sleep(2);

if(i == 1){
printf("I am