求1-5的阶乘和(1!+2!+3!+4!+5!)
时间: 2024-04-15 10:21:26 浏览: 13
以下是Java代码演示如何求1-5的阶乘和:
```java
import java.util.Scanner;
public class myPractice {
public static int fac(int n) {
// 求阶乘
if (n == 1) {
return 1;
}
return n * fac(n - 1);
}
public static int sum(int n) {
// 求阶乘和
if (n == 1) {
return 1;
}
return fac(n) + sum(n - 1);
}
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int n = scan.nextInt();
int ret = sum(n);
System.out.println(n + " 的阶乘和为:" + ret);
}
}
```
运行以上代码并输入5,将会输出结果:
```
5 的阶乘和为:153
```
相关问题
用FOR 求1-5的阶乘和(1!+2!+3!+4!+5!)
以下是使用for循环求1-5的阶乘和的示例代码:
```java
public class FactorialSum {
public static void main(String[] args) {
int n = 5;
int sum = 0;
int factorial = 1;
for (int i = 1; i <= n; i++) {
factorial *= i; // 计算阶乘
sum += factorial; // 累加阶乘和
}
System.out.println("1! + 2! + 3! + 4! + 5! = " + sum);
}
}
```
运行结果为:1! + 2! + 3! + 4! + 5! = 153
java求1-5的 的阶乘和(1!+2!+3!+4!+5!)(用for实现)
1!+2!+3!+4!+5!的结果为153。以下是Java代码实现:
```java
int sum = 0;
int factorial = 1;
for (int i = 1; i <= 5; i++) {
factorial *= i;
sum += factorial;
}
System.out.println(sum);
```