如何在Java中使用for循环在Java中打印倾斜的金字塔图案？ [英] How to print an inclined pyramid pattern in java using for loop in java?

问题描述

我一直在尝试使用java中的for循环语句打印不同的模式。现在，我想学习如何打印以下图案。基本上是一种倾斜的金字塔类型的图案。

I have been trying to print different patterns using for loop statement in java. And now I want to learn how to print the following pattern. It is basically an inclined pyramid type of pattern.

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

我试图做到这一点，但确实得到了正确的结果，但是问题是我认为我做这件事的方式很不方便。以下是代码：

I tried to make it and I did get the right results but the problem is that I think that the way I did it is an inconvenient way of doing it. Here is the code:

for (int x = 1; x <= 4; x++) {
    for (int y = 1; y <= x; y++) {
        System.out.print("*");
    }
    System.out.println();
}
for (int x = 1; x <= 3; x++) {
    for (int y = 3; y >= x; y--) {
        System.out.print("*");
    }
    System.out.println();
}

推荐答案

您的代码会产生正确的输出对我来说很清楚。我唯一能建议的是使用一个变量作为金字塔的大小，而不是硬编码的值。

Your code produces the right output and it clear enough to me. The only suggestion I could make is to use a variable for the size of the pyramid instead of a hard-coded value.

您可以用更紧凑的方式编写它，仅使用2个循环，例如：

You could write it in a more compact manner, only using 2 loops, like this:

int size = 7;
for (int row = 0; row < size; row++) {
    for (int column = 0; column <= Math.min(size-1-row, row); column++) {
        System.out.print("*");
    }
    System.out.println();
}

这里的想法是：

• 对于金字塔的每一行（因此该行从0变为大小）


• 我们需要确定要打印多少个星号。如果我们位于金字塔的上半部分，则等于我们所在的行。如果我们位于金字塔的下半部分，它等于 size-1-row （随着行的增加而减少）。因此，星号的计数是行和 size-1行的最小值：这是在单个语句中考虑的使用 Math.min（size-1-row，row）。

• For each row of the pyramid (so the row goes from 0 to size excluded)
• We need to determine how many asterisks to print. If we are in the upper-half of the pyramid, it is the equal to the row we're at. It we are in the lower-half of the pyramid, it is equal to size-1-row (decreasing with the row increasing). So the count of asterisk is the minimum of row and size-1-row: this is factored in a single statement using Math.min(size-1-row, row).

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