如何在c ++中保存对数组的更改[关闭]

Question

我必须编写一个程序来读取座位数并将其存储在二维数组中。空座位是标签，如果用户购买座位，它将变为 *。奇数排有 15 个座位​​，甚至有 20 个。 当我购买座位时，它会将 * 放在座位上，但当我购买另一个座位时，它会将其删除并在新购买的座位上加上 *。我怎样才能让它保存它打印在每个座位上的 *。

全球

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#include <iostream>

using namespace std;
int column2, row2,total = 0;
    char ab[20][15];
    char EMPTY = '#';
    char FULL = '*';
    int seat = 300;
    int seat2 = 0;
    int Quit = 1;
    int choice;
    int cost,answer,price;

void ShowSeats()
{    
    cout << "\tSeats" << endl;
    cout << "       0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19\n";

    for (int i = 0; i < 15; i++) {
        for (int j = 0; j < 20; j++) {
            ab[i][j] = EMPTY;
            if (i % 2 && j == 14) // 0 is false, 1 is true
            {
                break;
            }
            if (i == row2 && j == column2) // assuming these numbers start from 0
            {
                ab[i][j] = '*';
            }
        }
    }
    for (int i = 0; i < 15; i++) {
        cout << endl
             << "Row " << (i + 1);
        for (int j = 0; j < 20; j++) {

            cout << "  " << ab[i][j];

        }
    }
}



int main()
{

while (true){    
    cout << "Please select the row you would like to sit in: ";
    cin >> row2;
    cout << "Please select the seat you would like to sit in: ";
    cin >> column2;
    cout<< "Enter the price";
    cin >> price;
    if (ab [row2] [column2] == '*')
        {
            cout << "Sorry that seat is sold-out, Please select a new seat.";
            cout << endl;
        }
        else
        {
            cost = price;

            cout << "That ticket costs: " << cost << endl;
            cout << "Confirm Purchase? Enter (1 = YES)";
            cin >> answer;
            seat = seat - answer;
            seat2 += answer;



            if (answer == 1)
            {
                cout << "Your ticket purchase has been confirmed." << endl;
                ab [row2][column2] = FULL;
                total = total + cost;
                cout << "Would you like to look at another seat? (1 = YES)";
                cin>>Quit;
            }
    ShowSeats();
    }


}}

当我购买第 2 排和第 2 座时，它会显示这个 https://gyazo.com/0d8bd7ed02e969110db47b428c512f24

但是当我购买第 2 排座位 3 时，它不会保存之前的购买，我希望它同时保存两者。 https://gyazo.com/f865ba7145d1fafac246836975f2ee00

Answer 1

在Show_Chart，你正在做：

ab[i][j] = EMPTY;

对于每个 i 和 j。这意味着每次调用此函数时都会删除旧值。

删除该行以避免覆盖已保存的座位。

要在请求任何用户输入之前初始化所有席位，您可以在进入while 循环之前在main 中执行此操作：

for (int i = 0; i < 15; i++) 
        for (int j = 0; j < 20; j++) 
            ab[i][j] = EMPTY;