Question

我正在尝试编写一个程序，该程序接收来自用户的输入并使用提供的输入创建一个二维数组。它将值正确保存到数组中，但程序无法正确执行保存。

它可以保存错误的值。这是代码：

#include <iostream>
#include <fstream>
#include <unistd.h>
using namespace std;

int main()
{

 int num;
 int productId =1;


     cout << "Welcome To The Store Manager Registry! \n ";

     cout << "How Many Products Would You Like To Add To The Registry?\n";

     cin >> num;

 if (num <= 0)
        cout << "Please Enter A Valid Input More Than 0";

 int a[num-1][2]; //creates a two dimensional array for items
 for (;productId-1<num;productId++)
    {
         cout << "\nPlease Enter The Cost Price For Product Id "<< productId << " (ONLY NUMBERS) \n";
         cin >> a[productId-1][0];
         cout << "\nPlease Enter The Selling Price For Product Id "<< productId << " (ONLY NUMBERS) \n";
         cin >> a[productId-1][1];
         a[productId-1][2]=a[productId-1][1]-a[productId-1][0];
    } //Receives Input And Saves Values To Array
    cout << "Saving Data...";
    ofstream outputfile;
    outputfile.open("Statistics.txt");



 for (int b = 1;b<=num;b++){
        outputfile <<a[b-1][0]<<","<<a[b-1][1]<<","<<a[b-1][2]<<endl;//saves values to file
 }
        outputfile.close();


    /* Saves Array In This Format:
    Product Id       Cost Price          Selling price          Profit
    1                    10                   20                  10
    2                    20                   20                  0
    3                    30                   10                  -20

    But, Prints In This Format

        Product Id       Cost Price          Selling price          Profit
    1                    10                   20                     20
    2                    20                   20                     30
    3                    30                   10                    -20

    */


}

以下是输入：这是它保存的.txt文件：所以，最终，价值观不匹配，我坚持这个破碎的程序。

Answer 1

所以，而不是用

声明

int a[num-1][2];

我应该用

int a[num][3]

因为我需要3列和num行数。使用早期的代码，我尝试读取数组外的值。现在，代码不会在数组外读取。

如何将二维数组写入文本文件？

1 个答案: