C++库存项目移除

• 将库存增加到 10 件。做！！！
• 创建一个 for 循环，要求用户输入清单中的初始物料。做！！！
• 在 for 循环之后创建一个小故事，治疗师在其中更改两个项目（即项目 4 和 8）。我想要的是将一个项目交换为另一个项目，即您想将您的 {[项目] 换成 [item2] y 或 n
• 按字母顺序对清单进行排序。 如果需要，您可以使用自己的排序，但这里有一个气泡排序算法：

// A simple inventory program using a struct to store data
// in an array.

#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <sstream>
using namespace std;
// define a data structure
struct InventoryRecord
{
  string name;   // inventory item name
  int qty;       // how many are in stock
  double value;   // the value
};
// const for the max size of the record array
const int MAX_SIZE = 9;
// function prototypes
void addData(InventoryRecord list[], int& size);
void dispData(const InventoryRecord list[], int size);
void remData( const InventoryRecord list[], int size);
void saveFile(const InventoryRecord list[], int size);
void openFile(InventoryRecord list[], int& size);
char getMenuResponse();

int main(int argc, char *argv[])
{
  InventoryRecord recList[MAX_SIZE];
  int numOfRecs = 0;
  bool run = true;
  do
  {
    cout << "Hero's Inventory - " << numOfRecs << " items in your bag" << endl;
    switch ( getMenuResponse() ) 
    {
        case 'A': addData(recList, numOfRecs); break; 
        case 'D': dispData(recList, numOfRecs); break;
        case 'R': remData(recList, numOfRecs); break;
        case 'O': openFile(recList, numOfRecs); break;
        case 'S': saveFile(recList, numOfRecs); break;
        case 'Q': run = false; break;
        default : cout << "That is NOT a valid choice" << endl;
    }
  } while (run);
  cout << endl << "Program Terminated" << endl;
  // system("PAUSE"); // Program exits immediatly upon "Quit" if commented out
  return EXIT_SUCCESS;
}
// Task:     Allow data entry of one inventory item
// Accepts:  References to the inventory array and its size
// Returns:  Nothing
// Modifies: The array and size 'actual parameter'
// NOTE:     Could be modified to allow entry of more than one item
void addData(InventoryRecord list[], int& size)
{
  InventoryRecord tmp; // declare a temp item that we will load before putting in the array
  char response;
  char str[256]; // needed for cin.getline; we are going to use a char array
  if (size < MAX_SIZE) {
    system("cls");
    cout << "Please enter 10 items helpful to your quest! " << endl;
    cout << "Enter item: " << endl << endl;
    cout << "Name:     ";
    // Get up to 256 characters from the keyboard including white space.
    // Stop reading if encounter the n first. If there's any chance of 
    // more than 256 characters you will have to clean up cin with
    // cin.ignore before the next input.
    cin.getline(str, 256, 'n'); // for char arrays; different from the other getline
    tmp.name = str;
    cout << "Quantity: ";
    cin >> tmp.qty;
    cout << "Value:     ";
    cin >> tmp.value;
    cout << endl;
    // see if this record should be added to the array
    cout << "Add to inventory? (y/n) ";
    cin >> response;
    if (toupper(response) == 'Y') 
      list[size++] = tmp;
  } else {
    cout << "Inventory is full; cannot enter more units." << endl;
    system("pause");
  }
  system("cls");
}
void dispData(const InventoryRecord list[], int size)
{
  system("cls");
  double cost = 0;
  if(size < 1) {
    cout << "Nothing to display" << endl;
  } else {
    cout << "All Items in your Bag" << endl << endl;
    cout << fixed << setprecision(2);   
    cout << "Item Name              Qty     Value" << endl;
    cout << "~~~~~~~~~~~~~~~~~~" << endl;
    cout << left;     
    for (int i = 0; i < size; i++) {
      cout << setw(21) << list[i].name << right
           << setw(4)  << list[i].qty
           << setw(10) << list[i].value << left << endl;
           cost = cost + list[i].value * list[i].qty;
    }
    cout << "~~~~~~~~~~~~~~~~~~~" << endl;
    cout << right << setw(3) << size;
    cout << " items listed";
    cout << right << setw(19) << cost << endl << endl;
  }
  system("PAUSE");
  system("cls");
}
void remData(const InventoryRecord list[], int size) {
    system("cls");
    cout <<"Enter Item you wish to remove from your inventory: " << endl;// This is being displayed so user can see items in the inventory
    double cost = 0;
  if(size < 1) {
    cout << "Nothing to display" << endl;
  } else {
    cout << "All Items in your Bag" << endl << endl;
    cout << fixed << setprecision(2);   
    cout << "Item Name              Qty     Value" << endl;// It is not displaying right the alignment is off
    cout << "~~~~~~~~~~~~~~~~~~" << endl;
    cout <<"Item Name: ";/* from here I do not know what to do! What I want is have use type the item name they want removed
                            also display an error if they enter an  item wrong*/
    cout << left;     
    for (int i = 0; i < size; i++) {
      cout << setw(21) << list[i].name << right
           << setw(4)  << list[i].qty
           << setw(10) << list[i].value << left << endl;
           cost = cost + list[i].value * list[i].qty;
    }
    cout << "~~~~~~~~~~~~~~~~~~~" << endl;
    cout << right << setw(3) << size;
    cout << " items listed";
    cout << right << setw(19) << cost << endl << endl;
  }}
// Save records to disc
void saveFile(const InventoryRecord list[], int size) {
  ofstream outfi("Inventory.txt");
  // make sure the file stream is open before doing IO
  if (!outfi.fail()) { 
    system("cls");  
    cout << "Saving inventory to the disc ";
    for(int i = 0; i < size; i++) {
      outfi << list[i].name << ';' 
            << list[i].qty << ';'
            << list[i].value;
      // Start a new line after all but the last record
      // Simplifies reading the file as EOF is at end of last line
      if (i < size-1) outfi << endl;
    }
    cout << endl << size << " records writen to the disc." << endl;
    outfi.close();
    system("PAUSE");
    system("cls");
  } 
  else {
    cout << "ERROR: problem with file" << endl;
    system("PAUSE");
    system("cls");
  }
}
// Open file and load array
void openFile(InventoryRecord list[], int& size)
{
  ifstream infi("Inventory.txt");
  string str;
  stringstream strstrm;
  // make sure the file stream is open before doing IO
  if (!infi.fail()) { 
    system("cls");
    cout << "Reading inventory from the disc ";
    size = 0; // overwrite any existing records
    while(!infi.eof() && size < MAX_SIZE) {
      // get and store the name
      getline(infi, str, ';'); 
      list[size].name = str;
      // get, convert and store the quantity
      getline(infi, str, ';');
      strstrm.str(""); strstrm.clear(); // empty and clear the stringstream
      strstrm << str; 
      strstrm >> list[size].qty;
      // get, convert and store the cost
      getline(infi, str); 
      strstrm.str(""); strstrm.clear(); // empty and clear the stringstream
      strstrm << str; 
      strstrm >> list[size++].value;
    }
    cout << endl << size << " records read from the disc." << endl;
    system("PAUSE");
    system("cls");
  }
  else { // something went wrong with opening the file
    cout << "ERROR: problem with file" << endl;
    system("PAUSE");
    system("cls");
  }
}
char getMenuResponse()
// Task:     Put the menu on screen and get a response
// Accepts:  Nothing
// Returns:  The users response
// Modifies: Nothing
// NOTE:     Characters are far more intuitive at the command
//           line than numbers; avoid using numbers.
{
    char response;
    cout << endl << "Make your selection" << endl
         << "(A)dd Items, (D)isplay Items, (R)emove items, (O)pen File, (S)ave File, (Q)uit" << endl
         << "> ";
    cin >> response;
    cin.ignore(256, 'n');  
    // clean-up up to 256 chars including the delimiter specified (n, the endl) 
    // OR stop when the n is encountered after removing it.
    return toupper(response);
}