Question

您好我在代码中调用void initialize（）函数时遇到问题。我应该得到一个看起来像这样的数组

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其中数组在Initialize（）中定义，变量来自FIN，SteamPipe和GridPT类。我的代码在数组之前给出了第一组答案但是当它到达数组时我只得到符号'？'这就是在GridPT类中指定的内容。我认为我调用void函数的方式是错误的，或者传递变量有什么问题？我已经尝试取出const但仍然相同。这是我的代码.h文件

#include<iostream>
#include<istream>
#include<cmath>
#include<cstdlib>

using namespace std;

const int maxFinHeight = 100;
const int maxFinWidth = 100;

class Steampipe
{
private:
  int height, width;
  double steamTemp;

public:
  Steampipe (int H = 0, int W = 0, double sT = 0.0)
  {
    height = H;
    width = W;
    steamTemp = sT;
  }

  // Access function definitions
  int getWidth()const{return width;};
  int getHeight()const{return height;};
  double getSteamTemp()const{return steamTemp;};
  void setWidth(int dummysteamwidth) {width = dummysteamwidth;};
  void setHeight(int dummysteamheight){height = dummysteamheight;};
  void setSteamTemp(double dummysteamtemp){steamTemp = dummysteamtemp;};

  // Access function definitions
  friend istream& operator>>(istream& , Steampipe& ); // YOU MUST DEFINE
  friend ostream& operator<<(ostream& , const Steampipe& ); // YOU MUST DEFINE
};

class GridPt
{
private:
  double temperature;
  char symbol;

public:
  GridPt(double t = 0.0, char s = '?')
  {
    temperature = t;
    symbol = s;
  }

  // Access function definitions
  double getTemperature()const {return temperature;};
  char getsymbol() const {return  symbol;};

  void setTemperature (double T=0) {T=temperature;}
  void setsymbol (char S='?'){S=symbol;}
};

class Fin
{
private:
  int width, height; //width and height of fin
  int pipeLocationX, pipeLocationY; //grid location of lower left corner of steampipe
  double boundaryTemp; //temperature of fin surroundings
  Steampipe Pipe; //steampipe object - COMPOSITION
  GridPt GridArray[maxFinHeight][maxFinWidth]; // array of GridPts - COMPOSITION

public:
  int getwidth() {return width;}
  int getheight() {return height;}
  int getpipeLocationX(){return pipeLocationX;}
  int getpipeLocationY(){return pipeLocationX;}
  double get_boundarytemp(){return boundaryTemp;}
  void setwidth (int w){w=width;}
  void setheight (int h){h=height;} 
  friend istream& operator>>(istream& , Fin& ); // YOU MUST DEFINE
  friend ostream& operator<<(ostream& , const Fin& ); // YOU MUST DEFINE

  void initialize(); // YOU MUST DEFINE
};

void Fin::initialize()
{
  int j(0) ,i(0);
  for ( i = 0; i < height; i++)
  {
    for (  j = 0; j < width; j++)
    {
      if (   j == pipeLocationX && i == pipeLocationY
          && i <  Pipe.getHeight() + pipeLocationY
          && j < Pipe.getWidth() + pipeLocationX)
      {
        GridArray [j][i].setTemperature(Pipe.getSteamTemp());
        GridArray [j][i].setsymbol('H');
      }
      else if (j == (width -1) || i == (height -1) || j == 0 || i == 0)
      {
        GridArray [j][i].setTemperature(boundaryTemp);
        GridArray [j][i].setsymbol('C');
      }
      else
      {
        GridArray [j][i].setTemperature((Pipe.getSteamTemp() + boundaryTemp)/2);
        GridArray [j][i].setsymbol('X');
      }
    }
  } 
}



istream &operator >> (istream & in, Fin& f)
{
  int   ws, hs; 
  double  ts;
  char comma;

  cout << "Enter the height of the fin (integer) >>> ";
  in >> f.height;

  cout << "Enter the width of the fin (integer) >>> " ;
  in >> f.width;

  cout << "Enter the height of the streampipe (integer) >>> ";
  in >>hs;
  f.Pipe.setHeight(hs);
  cout << "Enter the width of the steampipe (integer) >>> ";
  in >> ws;
  f.Pipe.setWidth(ws);
  cout << "Enter coordinates of lower left corner of steampipe (X,Y) >>> ";
  in >> f.pipeLocationX >> comma >> f.pipeLocationY;

  cout << "Enter the steam temperature (floating point) >>> ";
  in >> ts;
  f.Pipe.setSteamTemp(ts);
  cout << "Enter the temperature around the fin (floating point) >>> "; 
  in >> f.boundaryTemp;
  return in;
}

ostream &operator << (ostream &stream, const Fin& t)
{
  int i = 0;
  int j = 0;

  stream << "The width of the fin is " << t.width << endl;

  stream << "The height of the fin is " << t.height << endl;

  stream << "The outside temperature is " << t.boundaryTemp << endl;

  stream << "The lower left corner of the steam pipe is at " 
         << t.pipeLocationX <<      "," << t.pipeLocationY << endl;

  stream << "The steampipe width is " << t.Pipe.getWidth() << endl;

  stream << "the steampipe height is " << t.Pipe.getHeight() << endl;

  stream << "The temperature of the steam is " << t.Pipe.getSteamTemp() << endl;

  for ( i = 0; i < t.height; i++)
{
    for (  j = 0; j < t.width; j++)
    {
        if (j == t.pipeLocationX && i == t.pipeLocationY && i < t.Pipe.getHeight() + t.pipeLocationY && j < t.Pipe.getWidth() + t.pipeLocationX)
        {
            t.GridArray [j][i].getTemperature();
            stream<<t.GridArray [j][i].getsymbol();

        }
        else if (j == (t.width -1) || i == (t.height -1) || j == 0 || i == 0)
        {
            t.GridArray [j][i].getTemperature();
            stream<<t.GridArray [j][i].getsymbol();
        }
        else
        {
            t.GridArray [j][i].getTemperature();
            stream<<t.GridArray [j][i].getsymbol();
        }

    }stream<<endl;
}   

  int coorx(0),coory(0);char comma;

  stream << "Enter the coordinates of the gridpoint of interest (X,Y) >>> "
         << endl;
  cin>>coorx>>comma>>coory;
  stream<<"The temperature at location ("<<coorx<<","<<coory<<") is "
         << t.GridArray << endl;

  return stream;
}

我的驱动程序文件cpp是：

#include "pipe.h"

int main()
{
  Fin one; 
  cin >> one;
  one.initialize();
  cout << one;

  return 0;
}

任何建议都将非常感谢。谢谢

Answer 1

在您的代码中，以下是错误的：

void setTemperature (double T=0) {T=temperature;}
void setsymbol (char S='?'){S=symbol;}

必须是：

void setTemperature (double T=0) {temperature = T;}
void setsymbol (char S='?') { symbol = S;}

顺便说一句：将函数定义放在标题中是不好的习惯（除非它是模板），而是将它们放在源文件中，只包含标题中的声明。

在您的代码中，您还可以直接在输出流中使用t.GridArray：
stream<<t.GridArray;
这不行。它不是ostream理解的函数或类型。使用已声明的i和j变量并逐步遍历数组的每个元素以打印它们，与初始化数组时相同。

调用void函数问题

1 个答案: