Question

我无法让这个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情。而且，平均值，低点和高点给出了错误的答案。程序应该读入一个文件并处理它们以找到当天所有临时温度的最高温度，最低温度和平均值。每天的价值与前一天相同。

有人可以指出我做错了吗？

#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;
}

Answer 1

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

i变量未在循环体内使用，所以你做了n次同样的事情。我认为您应该使用m1[day][...]更改m1[i][...]（m5和m25相同）。
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存储所见的第一天（您将在for循环中打印的第一天）。考虑到在源代码的其他方面没有引用dayCount，你可以摆脱它并写下：
```
if (time == 0)
  loopDay = day;
```
现在您必须更改for循环的上限：必须包含您看到的最后一天，因此< day必须为<= day。

还有其他事情要改变，但这是一个起点。

没有得到正确的输出

1 个答案: