java - 在 Java 中计算阶乘并打印步骤

Question

以下 Java 代码计算给定数字的阶乘并打印中间步骤。

public class Factorial {
   public static int getFactorial(int number) {
     int n = number;
     int factorial = 1;

     while(n > 1) {
       factorial *= n;
       n--;

       System.out.println(factorial + " * " + n + " = " + factorial);
     }

    return factorial;
   }
}

调用该方法时:

Factorial.getFactorial(4);

应该打印到控制台，如下所示:

4 * 3 = 12
12 * 2 = 24
24 * 1 = 24

但是它会打印如下内容:

4 * 3 = 4
12 * 2 = 12
24 * 1 = 24

我做错了什么？

Answer 1

发生这种情况是因为您仅打印 factorial 变量。替换:

System.out.println(factorial + " * " + n + " = " + factorial);

与:

System.out.println(factorial + " * " + n + " = " + factorial * n);