第7周作业1-循环大战

for循环语句：

import java.util.Scanner;
public class FactorialTest {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

System.out.print("请输入一个正整数:");
Scanner ScNumber=new Scanner(System.in);
int num=ScNumber.nextInt();
System.out.println();
int p = num;
for(int i=1;i<num;i++)
{
p=p*(num-i);
}
System.out.println(num+"!="+p);
}

}


运行结果：



while语句：

import java.util.Scanner;

public class FactorialTest1 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.print("请输入一个正整数:");
Scanner ScNumber=new Scanner(System.in);
int num=ScNumber.nextInt();
System.out.println();
int p=num;
int i=1;
while(i<num)
{
p=p*(num-i);
i++;
}
System.out.println(num+"!="+p);
}

}


运行结果：



do.......while语句：

import java.util.Scanner;

public class FactorialTest2 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.print("请输入一个正整数:");
Scanner ScNumber=new Scanner(System.in);
int num=ScNumber.nextInt();
System.out.println();
int p=num;
int i=1;
do
{
p=p*(num-i);
i++;
}while(i<num);
System.out.println(num+"!="+p);
}

}


运行结果：