课堂训练书本

package book;
import java.util.Scanner;
import java.lang.*;
public class test {
	public  static void main(String arg[])
	{
		int i,j=0;
		Scanner input =new Scanner(System.in);
		System.out.println("请输入购买书本数目：");
		int num=input.nextInt();
		int a=num%10;//表示余数
		int b=num/10;//取整数
		int money1=0,money2 = 0;
		money1=b*2*5*8/4*3;
		if(a==0)
		{
			
			money2=money1;
		}
		if(a==1)
		{
			money2=money1+8;
		}
		if(a==2)
		{
			money2=money1+2*8*95/100;
		}
		if(a==3)
		{
			money2=money1+3*8/10;
		}
		if(a==4)
		{
			money2=money1+4*8/5;
		}
		if(a==5)
		{
			money2=money1+5*8/4;
		}
		if(a==6)
		{
			money2=money1+8+5*8/4;
		}
		if(a==7)
		{
			money2=money1+3*8/10+4*8/5;
		}
		if(a==8)
		{
			money2=money1+2*4*8/5;
		}
		if(a==9)
		{
			money2=money1+4*8/5+5*8/4;
			
		}
		System.out.println("金额："+money2);
		
	}

}