Java 实例 – 阶乘
最后更新于：2022-03-27 01:03:46
Java 实例 – 阶乘
Java 实例一个正整数的阶乘（英语：factorial）是所有小于及等于该数的正整数的积，并且有0的阶乘为1。自然数n的阶乘写作n!。
亦即n!=1×2×3×…×n。阶乘亦可以递归方式定义：0!=1，n!=(n-1)!×n。
以下实例演示了 Java 阶乘代码的实现：
MainClass.java 文件
public class MainClass {
public static void main(String args[]) {
for (int counter = 0; counter <= 10; counter++){
System.out.printf("%d! = %d\n", counter,
factorial(counter));
}
}
public static long factorial(long number) {
if (number <= 1)
return 1;
else
return number * factorial(number – 1);
}
}
public static void main(String args[]) {
for (int counter = 0; counter <= 10; counter++){
System.out.printf("%d! = %d\n", counter,
factorial(counter));
}
}
public static long factorial(long number) {
if (number <= 1)
return 1;
else
return number * factorial(number – 1);
}
}
以上代码运行输出结果为：
0! = 1 1! = 1 2! = 2 3! = 6 4! = 24 5! = 120 6! = 720 7! = 5040 8! = 40320 9! = 362880 10! = 3628800