c++ - 如何打印空心正方形？

Question

我使用二维 for 循环为类作业制作形状生成函数，但无法制作空心正方形；只有一个填充的。我传入两个参数，即宽度和所使用的符号。

我已经试过好几次了，但最终我只是在一个未完成的情况下上交了它。它应该打印这样的东西

++++
+  +
+  +
++++

#include <iostream>
#include "shapemaker.h"

using namespace std;

void shapemaker::Initialize(int w, int h, char sym)
{
  width = w;
  height = h;
  symbol = sym;
}

int shapemaker::getcanWidth() {return width;}

int shapemaker::getcanHeight() {return height;}

char shapemaker::getSymbol() {return symbol;}

void shapemaker::setSymbol(char s) { symbol = s; }

void shapemaker::setcanWidth(int w) { width = w; }

void shapemaker::setcanHeight(int h) { height = h; }

void shapemaker::drawmidHorline()
{
  symbol = getSymbol();
  int drawingheight = getcanHeight();
  int drawingwidth = getcanWidth();
  double midpoint = getcanHeight()/2;
  for(int x = 0; x < drawingwidth; x++)
  {
    for(int y = 0; y < drawingwidth; y++)
    {
      if(x == midpoint)
      cout << getSymbol();
    }
    cout << endl;
  }
}

void shapemaker::drawmidVertline()
{
  symbol = getSymbol();
  int drawingheight = getcanHeight();
  int drawingwidth = getcanWidth();
  double midpoint = getcanWidth()/2;

  for(int x = 0; x < drawingwidth;x++)
  {
    for(int y = 0; y < drawingheight; y++)
    {
      if(y == midpoint)
      {
        cout << getSymbol();
      }
      cout << " ";
    }
    cout << endl;
  }
}

void shapemaker::drawWidthsizedFullSquare()
{
  symbol = getSymbol();
  int drawingwidth = getcanWidth();
  for(int x = 0; x < drawingwidth;x++)
  {
    cout << symbol;
    for(int y = 0; y < drawingwidth; y++)
    {
      cout << symbol;
    }
    cout << endl;
  }
}

void shapemaker::drawWidthsizedOpenSquare()
{
  symbol = getSymbol();
  int drawingwidth = getcanWidth();
  for(int x = 0; x < drawingwidth;x++)
  {
    cout << getSymbol();
    for(int y = 0; y < drawingwidth; y++)
    {
      if(x == 0 || x == drawingwidth-1)
      cout << getSymbol();
    }
    cout << getSymbol();
    cout << endl;       
  }
}

Answer 1

如果你想让drawWidthsizedOpenSquare打印这个

++++
+  +
+  +
++++

你应该这样写这个方法:

void shapemaker::drawWidthsizedOpenSquare()
{
  symbol = getSymbol();
  int drawingwidth = getcanWidth();
  for(int x = 0; x < drawingwidth;x++)
  {
    for(int y = 0; y < drawingwidth; y++)
    {
      if(x == 0 || x == drawingwidth-1 || y == 0 || y == drawingwidth-1)  // border cell case
      {
        cout << getSymbol();
      }
      else
      {
        cout << " ";
      }
    }
    cout << endl;       
  }
}