for 循环，允许变量相互覆盖

For loop that allows for variables to overwrite each other

本文关键字：变量 覆盖 循环 许变量 for      更新时间：2023-10-16

我的问题是我如何添加到我的for循环中，以便在它进行多次迭代时，变量会相互覆盖？

我正在尝试获取一个具有三个共享的输入文本文件，如下所示：

*谷歌（GOOG）

522.01 2 100

520.66 1.5 80

苹果 （AAPL）

389.27 2 150

401.82 1.8 150

Microsoft （MSFT）

25.06 2.5 100

25.07 2 80*

然后稍后将其打印/写入输出文本文件。

现在，当它运行其迭代 3 次时，它只显示库存 1 及其正确的数字，但随后显示错误的数字，并且没有其他数字的名称。那么我将如何去做，以便下一次迭代将覆盖并打印另一组答案呢？

以下是我拥有的 for 部分代码：

for (int x = 1; x <= 3; x++) // for loop to run this part of program 3 times
{
    getline(dataIn, stockName);//Gets the whole first line

    dataIn >> buyingAMT;//These just store whatever is in the line before every space, and sets it with a name 
    dataIn >> buyingComm;//So like it takes the characters leading up to the first space and stores it as buyingAMT.
    dataIn >> numberBought;
    dataIn >> sellingAMT;
    dataIn >> sellingComm;
    dataIn >> numberSold;

    //writing to a file

    buyingComm = buyingComm * buyingAMT;//Mathematical Calculations
    buyingAMT = buyingAMT * numberBought;
    sellingComm = (sellingComm / 100) * numberSold;
    sellingComm = sellingComm * sellingAMT;
    sellingAMT = sellingAMT * numberSold;
    profit = (sellingAMT - sellingComm) - (buyingAMT + buyingComm);
    //Displaying the calculated answers
    fout << setw(20) << left << stockName;
    fout << setprecision(2) << fixed << setw(15) << right << buyingAMT;
    fout << setprecision(2) << fixed << setw(15) << right << buyingComm;
    fout << setprecision(2) << fixed << setw(15) << right << sellingAMT;
    fout << setprecision(2) << fixed << setw(15) << right << sellingComm;
    fout << setprecision(2) << fixed << setw(15) << right << profit << endl;
    //Storing the results into the overall variables to be used later
    /*totalBuyingAMT += buyingAMT;
    totalBuyingComm += buyingComm;
    totalSellingAMT += sellingAMT;
    totalSellingComm += sellingComm;
    grandProfit += profit;
    */
}
getline(dataIn, junk);//Cleans the remaining unread data
dataIn.close();//closes the input file, so it cant be read any longer
fout.close();
cout << "congrats you are either now screwed or rich!";
return 1;

}

我得到什么作为输出

我需要得到什么

变量只要

不是const，就可以随时重写或复制。从您的代码来看，提取文本的方式存在问题。

dataIn >> buyingAMT;//These just store whatever is in the line before every space, and sets it with a name 
dataIn >> buyingComm;//So like it takes the characters leading up to the first space and stores it as buyingAMT.
dataIn >> numberBought;
dataIn >> sellingAMT;
dataIn >> sellingComm;
dataIn >> numberSold;

那么这里的dataIn和其他变量是什么样的类型呢？似乎您没有正确拆分文本，或者没有办法从dataIn中执行此操作。

这是一个小示例，其中一行取自 stdin（尽管它可以是任何流）

#include <iostream>
#include <string>
int main() {
  int i;
  std::string input;
  for(i=0;i<3;i++)
  {
    std::cout << "Please give me some input:";
    std::cin >> input;
    std::cout << "You gave me:" << input << std::endl;
  }
}
ofstream fout;//data type used to write the data taken from input file and put it on output file
fout.open(output_File_Name);
if (fout.fail())
{
    fout << "Input file not found: " << output_File_Name << endl;
    system("pause");
    return 0;
}
fout << setw(20) << left;//Setting the labels
fout << "STOCK";
fout << setw(15) << right;
fout << "BUYING AMT";
fout << setw(15) << right;
fout << "BUYING COMM";
fout << setw(15) << right;
fout << "SELLING AMT";
fout << setw(15) << right;
fout << "SELLING COMM";

fout << setw(15) << right;
fout << "PROFIT" << endl;
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