使用并行阵列的初学者编程学生

beginner programming student with parallel arrays

本文关键字：编程 初学者 并行 阵列      更新时间：2023-10-16

初学者程序员，对所有程序员都非常尊重。我的头发不见了，有时我会因为试图解决这些问题而感到筋疲力尽。Anyhoot 当前作业让我从我完成.txt文件中读取数据。执行计算并输出到屏幕。读入数据的变量比我应该写入输出文件的变量多。所以我读入了数据，现在我必须将tripNumber和FinalCost读入两个不同的数组，然后将反向数据写入文件。我已经掌握了大部分内容，但卡在了几个地方，这些地方在我的代码中应该很清楚。意识到每个人都有自己的问题，这不是一个悲伤的故事。我每周工作60 +小时，并试图获得学位。感谢您的任何帮助或建议，使这项复杂的技能更容易理解。

#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>
using namespace std;
int main()
{
//create two arrays
const int ARRAY_SIZE = 100; //array size of 100 elements
ifstream fileIn; //create file object 
ofstream fileSave; //create new output file
fileIn.open("TripInput.txt"); //read in file
//Variables to hold data from the file
int tripNbr = 0;
double fuelCost = 0;
double fuelTotal = 0;
double wasteDisp = 0;
double misCost = 0;
int counter = 0;
int nbrOfTrip[ARRAY_SIZE];
double totalCost[ARRAY_SIZE];
for(counter = 0; counter < ARRAY_SIZE; counter++)
{
nbrOfTrip[counter] = 0;
totalCost[counter] = 0;
}
cout<<"Welcome to My Space Travel Company"<<endl;
cout<<endl;
cout<<"Trip No"<<setw(10)<<"Fuel"<<setw(10)<<"Waste"<<setw(10)<<"Misc"<<setw(15)
<<"Discount Fuel"<<setw(15)<<"Final Cost"<<endl;
if(fileIn.fail())//test to see if file opened
{
cout<<"File did not open."<<endl;
}
while(fileIn>>tripNbr>>fuelCost>>wasteDisp>>misCost) //while loop to read in data from   file
{
fuelTotal = fuelCost - (fuelCost * .10);
double finalCost = fuelTotal + wasteDisp + misCost;
cout<<tripNbr<<setprecision(2)<<fixed<<setw(14)<<fuelCost<<setw(10)<<wasteDisp
    <<setw(10)<<misCost<<setw(15)<<fuelTotal<<setw(15)<<finalCost<<endl;
//Write trip number and final cost to the 2 parallel arrays...not sure how to
//to do this.

//open output file
fileSave.open("TripCost.txt");
//for loops to output data to file
for(counter = 0; counter < ARRAY_SIZE; counter++)
{
fileSave<< nbrOfTrip[counter]<<endl;
fileSave<< totalCost[counter]<<endl;
}
}
system("Pause");
return 0;
}

我想到了几件事。首先，您的"while循环以从文件中读取数据"在错误的位置结束。它应该是

while(fileIn>>tripNbr>>fuelCost>>wasteDisp>>misCost) //while loop to read in data from   file
{
    fuelTotal = fuelCost - (fuelCost * .10);
    double finalCost = fuelTotal + wasteDisp + misCost;
    cout<<tripNbr<<setprecision(2)<<fixed<<setw(14)<<fuelCost<<setw(10)<<wasteDisp
        <<setw(10)<<misCost<<setw(15)<<fuelTotal<<setw(15)<<finalCost<<endl;
    //Write trip number and final cost to the 2 parallel arrays...not sure how to
    //to do this.
}

输出到文件后，此循环结束。这意味着您将多次输出文件，这是不正确的。

其次，将行程号和最终成本写入数组非常简单。您只需要一个额外的变量来记录您添加的行程数。我称之为"旅行次数"。喜欢这个

int numberOfTrips = 0;
while(fileIn>>tripNbr>>fuelCost>>wasteDisp>>misCost) //while loop to read in data from   file
{
    fuelTotal = fuelCost - (fuelCost * .10);
    double finalCost = fuelTotal + wasteDisp + misCost;
    cout<<tripNbr<<setprecision(2)<<fixed<<setw(14)<<fuelCost<<setw(10)<<wasteDisp
        <<setw(10)<<misCost<<setw(15)<<fuelTotal<<setw(15)<<finalCost<<endl;
    //Write trip number and final cost to the 2 parallel arrays
    nbrOfTrip[numberOfTrips] = tripNbr;
    totalCost[numberOfTrips] = finalCost;
    ++numberOfTrips;
}

最后，当您将数据写入文件时，您应该只写入添加到并行数组的条目数，而不是整个数组。因此，最后一个循环应该使用前一个循环中的"trips数量"变量。喜欢这个

//for loops to output data to file
for(counter = 0; counter < numberOfTrips; counter++)
{
    fileSave<< nbrOfTrip[counter]<<endl;
    fileSave<< totalCost[counter]<<endl;
}
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