Java第三次作业

1. 输入两个数，交换后输出

package Exercise;

import java.util.Scanner;

public class e1 {

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

}

 

 

2.输入两个数，求平方和

package Exercise;
import java.util.Scanner;

public class e2 {

    /**
     * @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a,b的值");
        int a = input.nextInt();
        int b = input.nextInt();
        System.out.println(a*a+b*b);
    }

}

 

 3.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

package Exercise;
import java.util.Scanner;
public class e3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入商品的单价");
        double price= input.nextDouble();
        System.out.println("请输入商品的数量");
        int num=input.nextInt();
        double sum=price*num;
        System.out.println("总价为"+sum);
        int  discount=(int)(sum*0.8);
        System.out.println("活动价为"+discount);
        System.out.println("输入付款金额");
        int fukuan=input.nextInt();
        double zl=fukuan-sum;
        System.out.println("找零为"+zl);
    }

}

 

 

4.输入一个三位数，求个位，十位和百位。

package Exercise;

import java.util.Scanner;

public class e4 {

    /**
     * @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 num = input.nextInt();
        int ge = num % 10;
        System.out.println("个位是" + ge);
        int shi = num / 10 % 10;
        System.out.println("十位是" + shi);
        int bai = num / 100;
        System.out.println("百位是" + bai);
    }

}

 

 

5.输入大写字母，转成对应的小写字母

package Exercise;
import java.util.Scanner;
public class e5 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input =new Scanner(System.in);
        System.out.println("任意输入一个大写字母");
        String m=input.next();
        char n;
        n=m.charAt(0);
        System.out.println((char)(n+32));
    }

}

 

 6.输入2个数，用三目运算符，输出较大数

package Exercise;

import java.util.Scanner;

public class e6 {

    /**
     * @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();
        int max=a>b?a:b;
        System.out.println("输出较大数"+max);
    }

}