在Java中制作一个颠倒的三角形 [英] Make a upside down triangle in java

问题描述

我正在努力让我所做的三角朝下。
尝试了很多次，但我不知道该怎么做。

我知道的代码是：

  public static void drawPyramide（int lines，char symbol，boolean startDown）{
 // TRIANGLE 
 
 if（startDown）{ 
 //倒三角形应该在这里。 
} 
 
 else {
 int c = 1; （int i = 0; i  for（int j = i; j  System.out.print（ ）; （int k = 1; k< = c; k ++）{
 if（k％2 == 0）System.out.print（）; 
} 
 
 
 else System.out.print（symbol）; 
} 
 
 System.out.print（\\\
）; 
 c + = 2; 
 
 
 
 $ b $ / code> 

任何建议我如何翻转这个三角形？谢谢。

解决方案

要翻转三角形，你只需要改变迭代方向。而不是从 i = 0 到 i <您需要从 i = lines-1 下降至 i> = 0 >

您还需要将 c 更改为要开始的空格和符号数。

可能看起来像这样：

  int c = 2 * lines; 
 for（int i = lines-1; i> = 0; i--）
 for（int j = i; j  { 
 System.out.print（）; 
 
 for（int k = 1; k <= c; k ++）
 {
 if（k％2 == 0）
 {
 System.out.print（）; 
} 
 else 
 {
 System.out.print（symbol）; 
} 
} 
 
 System.out.print（\\\
）; 
 c  -  = 2; 
} 
  

I am trying to make the triangle I have made up side down. Tried many times, but I don't know how to do this.

The code I have know is:

public static void drawPyramide(int lines, char symbol, boolean startDown) {
    //TRIANGLE

    if(startDown) {
                //The triangle up side down should be here. 
            }

    else {
        int c = 1;
        for (int i = 0; i < lines; i++) {
            for (int j = i; j < lines; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k <= c; k++) {
                if (k%2==0) System.out.print(" ");

                else System.out.print(symbol);
            }

        System.out.print("\n");
        c += 2;
        }
    }

}

Any suggestions how I can "flip" this triangle? Thanks.

解决方案

To flip the triangle you really just need to change the direction of iteration. Instead of going from i = 0 to i < lines you need to go down from i = lines-1 to i >= 0

You also need to change the c to how many spaces and symbols you want to start with.

Could look like this:

int c = 2*lines;
for (int i = lines-1; i>=0; i--)
{
    for (int j = i; j < lines; j++)
    {
        System.out.print(" ");
    }
    for (int k = 1; k <= c; k++)
    {
        if (k % 2 == 0)
        {
            System.out.print(" ");
        }
        else
        {
            System.out.print(symbol);
        }
    }

    System.out.print("\n");
    c -= 2;
}

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