java - Java中使用for循环的等边三角形

Question

我正在尝试绘制一个由星号字符组成的等边三角形，但是当用户输入行号时，该行将被绘制为 "x" 并且整个三角形将是 "*" 但我在空格中出现错误。

这是我的代码:

int number_of_stars = getHeight();
for (int rows=1; rows <= getHeight(); rows++) 
       {
        for (int spaces=1; spaces <= number_of_stars; spaces++) 
        {
            System.out.print(" ");
        }

        if(rows == getRowNum()){
            for (int star=1; star <= rows; star++) 
            {
                System.out.print("x");
                System.out.print(" ");
                }
            System.out.println("");
            rows = getRowNum()+1;
            System.out.print(" ");
            System.out.print(" ");
            System.out.print(" ");

        }
        for (int star=1; star <= rows; star++) 
        {
            System.out.print("*");
            System.out.print(" ");
            }
        System.out.println("");
        number_of_stars = number_of_stars - 1;
        }

输出为

      * 
     * * 
    * * * 
   * * * * 
  * * * * * 
 * * * * * * 
x x x x x x x 

<小时/>

 * * * * * * * * * 
* * * * * * * * * * 

第九行和第十行不正确

Answer 1

IMO 您想要对特定行号进行的唯一更改是打印 x 而不是 *，为此您只需更改要打印的字符即可。我尝试了这个示例代码:

public static void main(String[] args) {
        int userRowNumber = 5;
        int height = 10;
        int number_of_stars = height;
        String charToPrint;
        for (int rows=1; rows <= height; rows++)
        {
            charToPrint = "*";
            if(rows == userRowNumber){
                charToPrint = "x";
            }
            for (int spaces=1; spaces <= number_of_stars; spaces++)
            {
                System.out.print(" ");
            }
            for (int star=1; star <= rows; star++)
            {
                System.out.print(charToPrint);
                System.out.print(" ");
            }
            System.out.println("");
            number_of_stars = number_of_stars - 1;
        }
    }

打印出预期的内容。对于您代码中的问题，我鼓励您自己调试并找出它。