循环语句实现输出九九乘法表和菱形

矫情吗；* 2024-03-17 18:18 11阅读 0赞

![3981ce5d9a9c438581f3aa847862191a.png][]

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

![7c374dd522d34205a96bc95bf57ef7a7.png][]

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

![04daac6f6a454762a10f408e63ec8bec.png][]

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

![ed0d9bac75564418bd3546516ad18168.png][]

![ee3148a9c1a24b60a12e3d3926bfa1a3.png][]

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();
            }
    
    
        }
    }

[3981ce5d9a9c438581f3aa847862191a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/d934f3d062054f87ad029f08e0003396.png
[7c374dd522d34205a96bc95bf57ef7a7.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/0be71752c69b43d0ba54aaa83e90ee95.png
[04daac6f6a454762a10f408e63ec8bec.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/9df36ffe30984419a920038606d95d9b.png
[ed0d9bac75564418bd3546516ad18168.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/faddf029002a467ead2507a81247b9e0.png
[ee3148a9c1a24b60a12e3d3926bfa1a3.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/43a96d1ff74545179c14041833040651.png