Question

我的任务是分配打印矩形。用户将输入要打印的长度，宽度和符号。由此将输出矩形。这部分任务完成了。我的下一个任务是从负值打印一个矩形，该矩形只打印矩形的轮廓（内部区域为空白）。我在创建在这种情况下使用的算法时遇到了困难。

任何帮助都将不胜感激。

干杯。

   import java.util.Scanner;

    public class Rectangle
{
public static void main(String[] args)
{

    boolean loopExecuted;
    String userContinue = "NO";

    // Loop to ask to do another rectangle
    do 
    {

    // Variables
    int length;
    int width;
    String symbol;
    char symbolz;
    int xLength;
    int yWidth;


                    // Name Scanner
    Scanner input = new Scanner(System.in);

                    // What program will do
    System.out.println("This program will print a rectangle with the symbol of your choice.  If you enter a positve integer the rectangle"
            + "will be filled, if you enter a negative integer, it will print the outline of the rectangle.\n");


                    // Ask for user input and check for validity

        do 
        {
           System.out.println("Please enter the length of the rectangle that is less than or equal to -10 and less than or equal to 10.");
           length = input.nextInt();
        }
        while (length < -10 || length > 10 || length == 0);

        do
        {
           System.out.println("Please enter the width of the rectangle that is less than or equal to -10 and less than or equal to 10.");
           width = input.nextInt();
        }
        while (width < -10 || width > 10 || width == 0);


        System.out.println("Please enter the symbol to be used for the rectangle");
        symbol = input.next();
        symbolz = symbol.charAt(0);

        System.out.println("You have entered the following values for length, width, and symbol: " + length + " ," + width + " ," + symbolz +"\n");


                 // Algorithm to print filled in rectangle.

        for (yWidth = 1; yWidth <= width; yWidth++) {
            for (xLength = 1; xLength <= length; xLength++) {
                System.out.print(symbolz);
            }

            System.out.println(" ");
        }

                // Algorithm to print outline of rectangle

        //TODO 
        for(yWidth = 1; yWidth >= width; yWidth--){
            for (xLength = 1; xLength >= length; xLength--){
                System.out.print(symbolz);
            }

            System.out.println(" ");
        }


                    // Repeat the program   

     loopExecuted = false;  
   do
           {
               if (!loopExecuted)
               {
                    System.out.println("\n\nWould you like to continue? Please either Yes or No");
               }
               else
               {
                   System.out.println("Please enter a valid response (Yes / No)");
               }
               userContinue = input.next();
               userContinue = userContinue.toUpperCase();
               loopExecuted = true;
           }

   while (!"YES".equals(userContinue) && !"NO".equals(userContinue));

   // Case Insensitive

    userContinue = userContinue.toUpperCase();

    } 
    while (userContinue.equals("YES"));

    }
   }

Answer 1

我会回答你的问题，但首先我会提出一个建议：使用功能！打破你的一大主要功能。将代码分解为更小的函数有助于使其更易于理解和维护（尤其是查找内容）。你使用评论的任何地方都是一个很好的功能。例如，getInput（），printFilledRectangle（int width，int height，char symbol）等。

现在提问：

考虑打印未填充矩形的规则。在我看来，有三个：

1）如果这是第一行，则打印符号n次（其中n =宽度） 2）如果这是最后一行，则打印符号n次 3）否则打印一个符号，打印n-2个空格，然后打印另一个符号

所以现在将这些规则合并到非填充循环中。希望有所帮助。

编辑：

好的 - 我可以帮你开始

 for (row = 0; row < height; row++)
     if (row == 0 || row == height - 1)  // first or last row
        // print your symbol n times, where n = width
     else // otherwise, this is an "internal" row
        // print 1 symbol, n-2 spaces, then 1 symbol again

在JAVA中使用符号打印矩形

1 个答案: