打印星号的 ASCII 菱形 [英] Print an ASCII diamond of asterisks

问题描述

我的程序打印出这样的钻石:

My program that prints out a diamond like this:

...............*
..........*    *    *
.....*    *    *    *    *
*    *    *    *    *    *    *
.....*    *    *    *    *
..........*    *    *    
...............*

但它仅在参数或菱形的每一侧为 4 时才有效.例如，如果我输入6，底部三角形的间距是错误的，我正在尝试解决.

But it only works if the parameter or each side of the diamond is 4. For example if I input 6, the spacing on the bottom triangle is wrong and I been trying to figure it out.

当参数改变时，底部的三角形不会改变，只有顶部的三角形会改变.它仅适用于输入 4.

The bottom triangle doesn't change when the parameter is changed, only the top one does. It only works for input 4.

public static void printMoreStars(int n) {
    int rowsPrime = 0;

    for (int i = n + 1; i > 0; i--) {
        for (int j = 0; j < (2 * i) - 1; j++) {
            System.out.print(" ");
        }
        for (int d = 0; d < (2 * rowsPrime) - 1; d++) {
            System.out.print("*" + " ");
        }
        System.out.println(); //new line character

        rowsPrime += 1;
        System.out.println(" ");
    }

    //bottom triangle
    for (int i = 1; i < n + 1; i++) {
        for (int j = 0; j < (2 * i) + 1; j++) {
            System.out.print(" ");
        }
        for (int d = 0; d < rowsPrime; d++) {
            System.out.print("*" + " ");
        }
        System.out.println(); //new line character

        rowsPrime -= 2;
        System.out.println(" ");
    }
}

推荐答案

您在使用 rowPrimes 时犯了两个错误.请参阅下面的注释:

You made two mistakes when using rowPrimes. See my annotations below:

public class Stars {
    public static void main(String[] args) {
        printMoreStars(Integer.parseInt(args[0]));
    }

    public static void printMoreStars(int n) {
        int rowsPrime = 0;

        for (int i = n + 1; i > 0; i--) {
            for (int j = 0; j < (2 * i) - 1; j++) {
                System.out.print(" ");
            }
            for (int d = 0; d < (2 * rowsPrime) - 1; d++) {
                System.out.print("*" + " ");
            }
            System.out.println();   //new line character

            rowsPrime += 1;
            System.out.println(" ");
        }

        rowsPrime -= 2; // <- middle line is already printed, so skip that

        //bottom triangle
        for (int i = 1; i < n + 1; i++) {
            for (int j = 0; j < (2 * i) + 1; j++) {
                System.out.print(" ");
            }
            for (int d = 0; d < (2 * rowsPrime) - 1; d++) { // <- changed condition to be the same as above
                System.out.print("*" + " ");
            }
            System.out.println();   //new line character

            rowsPrime--; // <- you have to decrease rowPrime by one.
            System.out.println(" ");
        }
    }
}

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