/* * File: qtest.c * ------------- * This program tests the queue.h interface by simulating a * simple waiting line.  Entering a name adds that person to * the waiting line.  Entering a blank line removes the name * at the head of the line and displays it on the screen. * Typing "quit" exits from the program. */#include <stdio.h>#include "genlib.h"#include "simpio.h"#include "strlib.h"#include "queue.h"/* Main program */main(){    queueADT waitingLine;    string line, name;    printf("Waiting line manager.\n");    printf("Type a name to enter it into the line.\n");    printf("Type a blank line to serve the first person in line.\n");    printf("Type \"quit\" to exit from the program.\n");    waitingLine = NewQueue();    while (TRUE) {        printf(":");        line = GetLine();        if (StringEqual(line, "quit")) break;        if (StringEqual(line, "")) {            if (QueueLength(waitingLine) == 0) {                printf("No one is waiting\n");            } else {                name = Dequeue(waitingLine);                printf("%s\n", name);            }        } else {            Enqueue(waitingLine, line);        }    }}