Java第三周作业

1.输入商品单价，数量，求总价。活动8折后抹零，计算活动价。
输入付款金额，计算找零并输出

import java.util.Scanner;


public class zjhdjzl {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入商品单价");
        double a=input.nextDouble();
        System.out.println("输入商品数量");
        double b=input.nextDouble();
        double c = a*b;
        System.out.println("总价是"+c);
        double d=c*0.8;
        int e=(int)d/1;
        System.out.println("活动价是"+e);
        System.out.println("输入付款金额");
        int f=input.nextInt();
        int g=f-e;
        System.out.println("找零是"+g);
        
    }

}

 2.输入一个三位数，求个位，十位和百位。

import java.util.Scanner;


public class sws {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入一个三位数");
        int a=input.nextInt();
        int ge=a%10;
        int shi=a%100/10;
        int bai=a/100;
        System.out.println("个位是"+ge);
        System.out.println("十位是"+shi);
        System.out.println("百位是"+bai);

    }

}

 3.输入大写字母，转成对应的小写字母。

import java.util.Scanner;


public class dhx {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入大写字母");
        char ch=input.next().charAt(0);
        System.out.println("小写"+(char)(ch+32));

    }

}

 4.输入2个数，用三目运算符，输出较大数。

import java.util.Scanner;


public class smjd {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入两个数");
        int a=input.nextInt();
        int b=input.nextInt();
        System.out.println(a>b?a:b);
    }

}

 4.输入2个数，交换后输出

import java.util.Scanner;


public class jh {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入a");
        int a=input.nextInt();
        System.out.println("输入b");
        int b=input.nextInt();
        System.out.println("输入c");
        int c=input.nextInt();
        c=a;
        a=b;
        b=c;
        System.out.println("a是"+a+"\tb是"+b);
    }

}

 6.输入2个数，求平方和

import java.util.Scanner;


public class pfh {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入a");
        int a=input.nextInt();        
        System.out.println("输入b");
        int b=input.nextInt();
        int c=a*a+b*b;
        System.out.println("平方和是"+c);
    }

}