#include "apue.h"#include <sys/wait.h>intmain(void){	char	line[MAXLINE];	FILE	*fpin;	if ((fpin = popen("myuclc", "r")) == NULL)		err_sys("popen error");	for ( ; ; ) {		fputs("prompt> ", stdout);		fflush(stdout);		if (fgets(line, MAXLINE, fpin) == NULL)	/* read from pipe */			break;		if (fputs(line, stdout) == EOF)			err_sys("fputs error to pipe");	}	if (pclose(fpin) == -1)		err_sys("pclose error");	putchar('\n');	exit(0);}