bzu-java(一)

//import java.util.Scanner;
//import java.util.Scanner;
import java.text.DecimalFormat;
public class test1{
	public static void main(String arg[])
	{
	//Scanner input=new Scanner(System.in);
	//int f=input.nextInt();
	for(int i=300;i>=0;i-=20)
		print_out(i);
	
	
	}
	static void print_out(int f ){
		double c=(5.0/9)*(f-32.0);
		DecimalFormat decimalFormat=new DecimalFormat(".0");
		String p=decimalFormat.format(c);
		System.out.println(f+"   "+p );
	}
}

public class test2{
	public static void main(String arg[])
	{
		for(int i=100;i<=999;i++)
		{ int ge=i%10;
		  int shi=i/10%10;
		  int bai=i/100;
		  if(ge*ge*ge+shi*shi*shi+bai*bai*bai==i)
			 System.out.println(i);
			
			
		}
	}
}

public class test3{
public static void main(String args[]){
	long sum=0;
	for(int i=1;i<=20;i++)
	{   long temp=1;
		for(int n=1;n<=i;n++)
			temp=n*temp;
	 sum=sum+temp;
	}
	System.out.println(sum);
}
}

import java.util.Scanner;
public class test4{
public static void main(String args[]){
	Scanner input=new Scanner(System.in);
	System.out.println("please input fangzhen's row and col,and entrue \"Enter\"");
	int n=input.nextInt();	
	int fangzhen[][]=new int[n][n];
	for(int i=0;i<n;i++)
		for(int j=0;j<n;j++)
		   fangzhen[i][j]=input.nextInt();
	int sum=0;
	for(int i=0;i<n;i++)
		sum+=fangzhen[i][i]+=fangzhen[i][n-i-1];
	System.out.println(sum);
		
	
}
	
}

import java.util.Scanner;
public class test5{
	public static void main(String args[]){
		Scanner input=new Scanner(System.in);
		System.out.println("please input Array's length,and entrue \"Enter\"");
		int n=input.nextInt();
		int fangzhen[]=new int[n];
		for(int i=0;i<n;i++)
			 fangzhen[i]=input.nextInt();
		int zuida=fangzhen[0],zuida_index=0;
		int zuixiao=fangzhen[0],zuixiao_index=0;
		for(int i=0;i<n;i++)
				if(fangzhen[i]>zuida){
					zuida=fangzhen[i];
				    zuida_index=i;}
		for(int i=0;i<n;i++)
				if(fangzhen[i]<zuixiao){
				zuixiao=fangzhen[i];
				zuixiao_index=i;}
		
		int m=fangzhen[0];
		fangzhen[0]=fangzhen[zuida_index];
		fangzhen[zuida_index]=m;
		m=fangzhen[n-1];
		fangzhen[n-1]=fangzhen[zuixiao_index];
		fangzhen[zuixiao_index]=m;
		
		for(int i=0;i<n;i++)
		System.out.print(fangzhen[i]);
				
	}
}