Java阶乘计算-优快云博客

本文链接：https://blog.youkuaiyun.com/liaojun9527/article/details/23742467

本文提供了三种不同的Java程序实现计算阶乘的方法：for循环、while循环和do-while循环。每种方法都通过读取用户的输入并计算从1到指定数字N的阶乘。

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import java.io.BufferedReader;

import java.io.IOException;
import java.io.InputStreamReader;

public class FactorialTest {
 public static void main(String[] args) throws IOException{
  BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("请输入N:");
    double one = Integer.parseInt(in.readLine());
    double sum=1;
    for(double i=1;i<=one;i++){
     sum*=i;
    } 
    System.out.println(one+"的阶乘"+sum);
   }
}

for循环

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class FactorialTest {
 public static void main(String[] args) throws IOException{
  BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("请输入N:");
    int one = Integer.parseInt(in.readLine());
    int sum=1;
    int i=1;
    while( i<=one){
     sum*=i;
     i++;
    } 
    System.out.println(one+"的阶乘"+sum);
   }
}

while循环

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class FactorialTest {
 public static void main(String[] args) throws IOException{
  BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("请输入N:");
    int one = Integer.parseInt(in.readLine());
    double sum=1;
    int i=1;
    do{
     sum*=i;
     i++;
    }while(i<=one); 
    System.out.println(one+"的阶乘是"+sum);
   }
}

do-while循环

=。=没有按老师要求来做的，只是输出了特定的数回去再弄从1到n的