acadeawards.cpp

本人是个新手并不是很懂这个

/*	This program maintains and displays a list of
	Academy Awards Motion Pictures.
	
	Written by:  G & F
	Date:        2/1998
	
	Revisions:   4/1999 Converted to C++
	                    Added delete logic (not in text)

	Copyright(C) 2000 Brooks/Cole Publishing
	             Thomson Learning
	             All Rights Reserved	
*/

#include <fstream.h>
#include <iomanip.h>
#include <stdlib.h>
#include <cType.h>
#include "ADT.h"


const short STR_MAX = 41;

struct PICTURE
	{
	 short   key;                                // year
	 char    picture [STR_MAX];
	 char    director[STR_MAX];
	}; // PICTURE 

//	Prototype Declarations 
	void  instr      (void);
	void  search     (List <PICTURE, short>& list);
	void  printList  (List <PICTURE, short>& list);
	void  process    (List <PICTURE, short>& list);
	char  getChoice  (void); 
	void  buildList  (List <PICTURE, short>& list);
	void  deletePic  (List <PICTURE, short>& list);   //Not in text

int main (void)
{
//	Local Definitions 
	List<PICTURE, short> list;
	
//	Statements 
	instr ();
	buildList (list);
	process   (list);

	cout << "End Best Pictures\n"
	     << "Hope you found your favorite!\n";
	return 0;
}	// main 

/*	==================== instr ====================
	Print instructions to user.
	   Pre    nothing
	   Post   instructions printed
*/
void instr (void)
{
//	Statements 
	cout << "This program will print the Academy Awards \n"
	     << "Best Picture of the Year and its director. \n"
	     << "Your job is to enter the year;  we will do \n"
	     << "the rest. Enjoy.\n\n";
	return;
}	// instr 

/*	==================== buildList ====================
	Reads a text data file and loads the linked list.
	   Pre    file exists in format: yy;pic;dir\n
	   Post   list contains data
	          -or- program aborted if problems
*/
void buildList (List <PICTURE, short>& list)
{
//	Local Definitions 
	ifstream fsData;
	int      addResult;
	PICTURE  pic;

//	Statements
	fsData.open("pictures.dat");
	if (!fsData)
	   {           
	    cerr << "\aError opening input file\n";
	    exit (110);
	   } // if
     
	while (fsData >> pic.key) 
	   {
	    fsData.getline (pic.picture,  
	                    sizeof(pic.picture), ';');
	    fsData.getline (pic.director, sizeof(pic.director)); 

	    // Insert into list 
	    addResult = list.addNode (pic);
	    if (addResult != 0)
	       if (addResult == -1)
	          {
	           cout << "Memory overflow adding movie\a\n"; 
	           exit (120);
	          } // Add overflow
	       else
	          cout << "Duplicate year: " 
	               << pic.key  
	               << " not added\n\a";
	   } // while 
	cout << endl;
	return;
}	//  buildList

/*	==================== process ====================
	Process user choices.
	   Pre    list has been created
	   Post   all of user's choices executed
*/
void process (List<PICTURE, short>& list)
{
//	Local Definitions 
	char choice;

//	Statements 
	do
	   {
	    choice = getChoice ();

	    switch (choice)
	       {
	        case 'P': printList (list);
	                  break;
			case 'D': deletePic(list);
			          break;
	        case 'S': search (list);
	        case 'Q': break;
	       } // switch 
	   } while (choice != 'Q');
	return;
}	// process

/*	==================== getChoice ====================
	Prints the menu of choices.
	   Pre    nothing
	   Post   menu printed and choice returned
*/
char getChoice (void)
{
//	Local Definitions 
	char choice;
	bool valid;
	
//	Statements 
	cout << "======== MENU ======= \n"
	     <<  "Here are your choices:\n"
	     <<  "  D: Delete a year: \n"
	     <<  "  S: Search for a year\n"
	     <<  "  P: Print all years  \n"
	     <<  "  Q: Quit             \n\n"
	     <<  "Enter your choice: ";
	do
	   {
	    cin >> choice;
	    choice = toupper(choice);
	    switch (choice)
	       {
	        case 'D':
	        case 'S':
	        case 'P':
	        case 'Q': valid = true;
	                  break;
	        default:  valid = false;
	                  cout << "\aInvalid choice\n"
	                        << "Please try again: ";
	                  break;
	       } // switch 
	   } while (!valid);
	return choice;
}	// getChoice 

/*==================== printList ====================
	Prints the entire list.
	   Pre    list has been created
	   Post   list printed
*/
void printList (List <PICTURE, short>& list)
{
//	Local Definitions 
	PICTURE pic;
	
//	Statements 
	
	//Get first node 
	if (list.listCount () == 0)
	    cout <<"Sorry, nothing in the list\n\a";
	else
	   {
	    cout << "\nBest Pictures List\n";
	    list.getNext (0, pic);
	    do
	      {
	        cout.setf (ios::left);
	        cout << pic.key << "  "
	             << setw (sizeof(pic.picture))  
	             << pic.picture  << " "
	             << setw (sizeof(pic.director)) 
	             << pic.director << endl;
	        cout.unsetf (ios::left);
	      } while (list.getNext (1, pic));
	    cout << "End of Best Pictures List\n\n";
	   } // else 
	return;
}	// printList 

/*	==================== search ====================
	Searches for year and prints year, picture, and
	director.
	Pre    list has been created
	       user has selected search option
	Post   year printed or error message
*/
void search (List<PICTURE, short>& list)
{
//	Local Definitions 
	short    year;
	bool    found;
	
	PICTURE pic;
	
//	Statements
     
	cout << "Enter a four digit year: ";
	cin  >> year;
	
	found = list.retrieveNode (year, pic);
	
	if (found)
	    cout << pic.key      << " \""
	         << pic.picture  << "\"  Directed by: "
	         << pic.director << endl;
	else
	    cout << "Sorry, but " << year 
	         << " is not available.\n";
	return;
}	// search 

//	==================== deletePic ====================
/*  Deletes picture from list and prints year, picture, 
	and director after delete.
	Pre    list has been created
	       user has selected delete option
	Post   year deleted and data printed or error message
*/
void deletePic (List<PICTURE, short>& list)
{
//	Local Declarations 
	short    year;
	bool    found;
	
	PICTURE pic;
	
//	Statements
     
	cout << "Enter a four digit year to be deleted: ";
	cin  >> year;
	
	found = list.removeNode (year, &pic);
	
	if (found)
	    cout << pic.key      << " \""
	         << pic.picture  << "\"  Directed by: "
	         << pic.director << " "
	         << "deleted.\n\n";
	else
	    cout << "\aSorry, but " << year << " is not in list.\n\n";
	return;
}	// search 


/*	Results
This program will print the Academy Awards 
Best Picture of the Year and its director. 
Your job is to enter the year;  we will do 
the rest. Enjoy.

Duplicate year: 1942 not added

======== MENU ======= 
Here are your choices:
  S: Search for a year
  P: Print all years  
  Q: Quit             

Enter your choice: p

Best Pictures List
1932  Cavalcade                                 Frank Lloyd                              
1934  It Happened One Night                     Frank Capra                              
1938  You Can't Take It With You                Frank Capra                              
1939  Gone With the Wind                        Victor Fleming                           
1941  How Green Was My Valley                   John Ford                                
1942  Mrs. Miniver                              William Wyler                            
1943  Casablanca                                Michael Curtiz                           
1945  The Lost Weekend                          William Wyler                            
1946  The Best Years of Our Lives               William Wyler                            
1947  Gentleman's Agreement                     Elia Kazan                               
1950  All About Eve                             Joseph L. Mankiewicz                     
1953  From Here To Eternity                     Fred Zinnemann                           
End of Best Pictures List

======== MENU ======= 
Here are your choices:
  S: Search for a year
  P: Print all years  
  Q: Quit             

Enter your choice: s
Enter a four digit year: 1932
1932 "Cavalcade"  Directed by: Frank Lloyd
======== MENU ======= 
Here are your choices:
  S: Search for a year
  P: Print all years  
  Q: Quit             

Enter your choice: q
End Best Pictures
Hope you found your favorite!
*/