循环语句实现输出九九乘法表和菱形-蒲公英云

循环语句实现输出九九乘法表和菱形

矫情吗；* 2024-03-17 18:18 130阅读 0赞

public class Multiplicationtable {
    public static void main(String[] args) {
        for (int i = 1; i <= 9; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.printf("%d ✖ %d = %d   ", j, i, i * j);
            }
            System.out.println();
        }
    }
}

倒三角只需把i换成int i = 9; i >= 1; i—即可

public class Multiplicationtable {
    public static void main(String[] args) {
        for (int i = 9; i >= 1; i--) {
            for (int j = 1; j <= i; j++) {
                System.out.printf("%d ✖ %d = %d   ", j, i, i * j);
            }
            System.out.println();
        }
    }
}

我们还可以加上随机颜色，这样变得更好看

public class Multiplicationtable {
    public static void main(String[] args) {
        //文字颜色为30 黑色 背景为44 紫色
        //System.out.println("\033[30;44m hello 30 world \033[0m");
        //实例化随机数
        Random r = new Random();
        for (int i = 9; i >= 1; i--) {
            for (int j = 1; j <= i; j++) {
                System.out.printf("\033[%dm%d ✖ %d = %d\033[0m   ",r.nextInt(31,37), j, i, i * j);
            }
            System.out.println();
        }
    }
}

目标输出一个菱形图案

public class Rhomboid {
    public static void main(String[] args) {
        int aa=20;
        for (int i = 1; i <=30; i+=2) {
            aa--;
            for (int s = 0; s < aa; s++){
                System.out.print(" ");
            }
            for (int j = 0; j < i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
        for (int i = 27; i >=1; i-=2) {
            aa++;
            for (int s = 0; s < aa; s++){
                System.out.print(" ");
            }
            for (int j = 0; j < i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}