镶有嵌套循环的钻石 [英] Diamond with nested for loops

问题描述

我正在尝试使用嵌套的 for 循环来显示一个星号菱形.

I am trying to display a diamond of asterisks using nested for loops.

到目前为止，这是我的代码:

Here is my code so far:

public class Diamond {
    public static void main(String[] args) {
        int size = 9;
        for (int i = 1; i <= size; i += 2) {
            for (int k = size; k >= i; k -= 2) {
                System.out.print(" ");
            }
            for (int j = 1; j <= i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }// end loop

        for (int i = 1; i <= size; i += 2) {
            for (int k = 1; k <= i; k += 2) {
                System.out.print(" ");
            }
            for (int j = size; j >= i; j--) {
                System.out.print("*");
            }
            System.out.println();
        }// end loop
    }
}

这很接近，但是我将两次打印9个星号的行.

This is close, but I'm printing the line of 9 asterisks twice.

如何调整第二个 for 循环，以7个星号和2个空格开始输出?

How can I adjust the second for loop to start the output at 7 asterisks and 2 spaces?

推荐答案

在您的第一个for循环中，删除 = 标记，然后使用< 例如 for(int i = 1; i< size; i + = 2).

In your first for loop remove = mark and just use < e.g. for (int i = 1; i < size; i += 2).

完整代码:

int size = 9;

for (int i = 1; i < size; i += 2) {
    for (int k = size; k >= i; k -= 2) {
        System.out.print(" ");
    }
    for (int j = 1; j <= i; j++) {
        System.out.print("*");
    }
    System.out.println();
}// end loop

for (int i = 1; i <= size; i += 2) {
    for (int k = 1; k <= i; k += 2) {
        System.out.print(" ");
    }
    for (int j = size; j >= i; j--) {
        System.out.print("*");
    }
    System.out.println();
}// end loop

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