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我无法让该程序以正确的格式输出内容。setw 函数似乎没有做我想做的事。此外，平均值、低点和高点都给了我错误的答案。该程序应该读入一个文件并处理它们以找到当天的最高温度、最低温度和所有温度的平均值。每天的值与前一天相同。

有人可以指出我做错了什么吗？

#include <iostream>
#include <iomanip>
#include <conio.h>
#include <fstream>
#include <string>

double averageTemp(double total, int number);
double lowTemp(double valueLow);
double highTemp(double valueHigh);
double high = 0;
double low = 0;

int main()
{
    std::string dummy = "";
    int day, time = 0;

    double input1[10][50], input5[10][50], input25[10][50];
    /*
    Keeps track of the data:
        Dimension 1: stores the input for each time of the day.
    */

    double m1[10][3], m5[10][3], m25[10][3];
    /*
    Process data: 
        Dimension 1:
            Index 1: Keeps track of day
        Dimension 2:
            Index 1: Average temp
            Index 2: Low temp
             Index 3: High temp
    */

   std::ifstream datain;
   std::ofstream dataout;

    datain.open("curiosity234X.dat");
    dataout.open("output.dat");

    for (unsigned int i = 0; i < 4; i++)
    {
        getline(datain, dummy);
    }

    int dayCount = 0, loopDay;

    while (datain >> day >> dummy >> dummy >> input1[day][time] 
                  >> input5[day][time] >> input25[day][time])
    {
                  while (dayCount == 0)
                  {
                        loopDay = day - 1;
                        dayCount++;
                  }

     m1[day][0] = averageTemp(input1[day][time], time);
     m1[day][1] = lowTemp(input1[day][time]);
     m1[day][2] = highTemp(input1[day][time]);

     m5[day][0] = averageTemp(input5[day][time], time);
     m5[day][1] = lowTemp(input5[day][time]);
     m5[day][2] = highTemp(input5[day][time]);

     m25[day][0] = averageTemp(input25[day][time], time);
     m25[day][1] = lowTemp(input25[day][time]);
     m25[day][2] = highTemp(input25[day][time]);

     time++;
    }

    dataout << std::setw(5) << std::fixed;
    dataout << "Average" << "Low" << "High" << std::endl 
            << "Temp" << "Temp" << "Temp" <<std::endl
            << "1 meter" << ".5 meters" << ".25 meters" << std::endl;

    std::cout << std::setw(5) << std::fixed;
    std::cout << "Average" << "Low" << "High" << std::endl 
              << "Temp" << "Temp" << "Temp" <<std::endl
             << "1 meter" << ".5 meters" << ".25 meters" << std::endl;

    for (unsigned int i = loopDay; i < day; i++)
    {
        dataout << std::fixed << std::setprecision(1) << std::setw(5);
        dataout
                << m1[day][0] << m1[day][1] << m1[day][2]
            << m5[day][0] << m5[day][1] << m5[day][2]
                << m25[day][0] << m25[day][1] << m25[day][2] 
                << std::endl;

        std::cout << std::fixed << std::setprecision(1) << std::setw(5);
        std::cout
                  << m1[day][0] << m1[day][1] << m1[day][2]
          << m5[day][0] << m5[day][1] << m5[day][2]
              << m25[day][0] << m25[day][1] << m25[day][2] 
                  << std::endl;
    }

    std::cout << std::endl << std::endl << std::endl
              << "The output.dat file has been written and transmitted."
              << std::endl;

    _getch();
    return 0;
}

double lowTemp(double valueLow)
{
    if (valueLow < low)
    {
        ::low = valueLow;

        return valueLow;
    } else 
    {
        return low;
    }
}

double highTemp(double valueHigh)
{ 
    if (valueHigh > high)
    {
        ::high = valueHigh;

        return valueHigh;
    } else 
    {
        return high;
    }
}

double averageTemp(double total, int number)
{
    double average = total/double(number);

    return average;
}
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1 回答 1

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  • 请检查此循环：
    for (unsigned int i = loopDay; i < day; i++) { ... }

    该i变量未在循环体内使用，因此您正在做同样的事情 n 次。我认为你应该改变（与m1[day][...]和相同）。m1[i][...]m5m25

  • 关于loopDay变量：

    while (dayCount == 0)
{
  loopDay = day - 1;
  dayCount++;
}

    我想你的意思是：

    if (dayCount == 0)
  loopDay = day;

++dayCount;

    以这种方式loopDay存储看到的第一天（您将在 for 循环中打印的第一天）。考虑到dayCount源代码的其他点没有引用它，您可以摆脱它并编写：

    if (time == 0)
  loopDay = day;

  • 现在您必须更改 for 循环中的上限：必须包含您看到的最后一天，因此< day必须包含<= day.

还有其他事情需要改变，但这是一个起点。

于 2014-02-23T10:35:34.523 回答