java - 如何使用嵌套循环分别输出整数的幂及其扩展形式

Question

我想输出从 n (0) 到 n (10) 的功率表，只使用扫描仪输入基数。

目前，我在设置时遇到困难

代码:

else if (option == 2){
                int base = keyboard.nextInt();
                for (int x = base; x <= base; x++){
                    System.out.print(base+"^");
                    for (int y = 0; y <= 10; y++){ // "y" is exponent
                        System.out.print(y+"=");
                }
                System.out.println("");
            }
        }

样本输入:

  2
  5

预期输出:

     5^0=
     5^1=
     5^2=
     5^3=
     - - - several lines are skipped here - - -
     5^10=

注意:这不是预期的输出，但我想自己尝试代码这只是将我带到最终结果的步骤

Answer 1

您的代码中的问题:

您已使用 result在循环内部，因此每次迭代都会重置。

您已将打印语句放入循环

你需要乘以result与 base每次迭代都没有完成。

请按以下步骤操作:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        int option = keyboard.nextInt();
        int base = keyboard.nextInt();
        int exponent = keyboard.nextInt();
        int result = 1;
        if (option == 1) {
            for (int x = base; x <= base; x++) {
                if (exponent <= 1) {
                    System.out.print(base + "^" + exponent);
                } else {
                    System.out.print(base + "^" + exponent + "=");
                }
                for (int y = 1; y <= exponent; y++) {
                    System.out.print(exponent == 1 ? "" : (base + (y < exponent ? "*" : "")));
                    result *= base;
                }
                System.out.print("=" + result);
            }
        }
    }
}

示例运行:

1
2
5
2^5=2*2*2*2*2=32

[更新]

根据您的评论，您还没有学会 ternary operator但我强烈建议你学习它。下面给出的解决方案是不使用三元运算符:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        int option = keyboard.nextInt();
        int base = keyboard.nextInt();
        int exponent = keyboard.nextInt();
        int result = 1;
        if (option == 1) {
            for (int x = base; x <= base; x++) {
                if (exponent <= 1) {
                    System.out.print(base + "^" + exponent);
                } else {
                    System.out.print(base + "^" + exponent + "=");
                }
                for (int y = 1; y <= exponent; y++) {
                    if (y < exponent) {
                        System.out.print(base + "*");
                    } else if (exponent != 1) {
                        System.out.print(base);
                    }
                    result *= base;
                }
                System.out.print("=" + result);
            }
        }
    }
}