Question

我是初学者，刚刚开始编码。我写了这个得到下面提到的输出，也得到了一个结果。但我觉得我的代码效率不高，有人可以告诉我如何写得更好吗？

package basic;

import java.util.Scanner;

public class Pattern {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        System.out.println("Enter the number of rows?");
        int n = scan.nextInt();

        int num1 = 1;

        for (int i = 1; i <= n; i++) {
            for (int k = n - 1; k >= i; k--) {
                System.out.print(" ");
            }
            for (int j = 1; j <= i; j++) {
                System.out.print(num1);
            }
            System.out.println();
            num1 = num1 + 1;

        }

    }
}

Answer 1

改善建议

您的num1变量是不必要的

循环不必要。

package basic;

import java.util.Scanner;

public class Pattern {

public static void main(String[] args) {

    Scanner scan = new Scanner(System.in);

    System.out.println("Enter the number of rows of the pyramid?");
    int n = scan.nextInt();

    for (int i = 1; i <= n; i++) {
        for (int j=1; j<=n;j++){
            if (j <= n-i){
                System.out.print(" ");
            }else{
                System.out.print(i);
            }
        }
        System.out.println()
    }

}

输出：当输入为5时

**** 1

*** 22

** 333

* 4444

55555

如何改进此代码以打印数字三角形？

1 个答案: