在java中制作一个倒三角形

问题描述

我正在尝试使我制作的三角形面朝下.试了很多次，不知道怎么弄.

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.

我知道的代码是:

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("
");
        c += 2;
        }
    }

}

有什么建议可以翻转"这个三角形吗?谢谢.

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

推荐答案

要翻转三角形，你真的只需要改变迭代的方向.而不是从 i = 0 到 i <lines 你需要从 i = lines-1 到 i >= 0

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

您还需要将 c 更改为要以多少个空格和符号开头.

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

可能是这样的:

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("
");
    c -= 2;
}

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