第三次作业

随堂练习

1.输入两个数，交换后输出

package text1;
import java.util.Scanner;
public class HelloWorid{
         public static void main(String[] args) {
       Scanner input=new Scanner(System.in);
                System.out.println("请输入要交换的数字：");
                int a=input.nextInt();
                int b=input.nextInt();
                int c;
                c=a;
                a=b;
                b=c;
                System.out.println(a + " " +b);
    }
}

 

 

2.输入两个数，求平方和

package text1;
import java.util.Scanner;
public class HelloWorid{
         public static void main(String[] args) {
       Scanner input=new Scanner(System.in);
                System.out.println("请输入要交换的数字：");
                int a=input.nextInt();
                int b=input.nextInt();
                int c;
                c=a*a+b*b;
                System.out.println("平方和是"+c);
    }
}

 

 

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。

package text1;
import java.util.Scanner;
public class HelloWorid{
         public static void main(String[] args) {
       System.out.println("请输入商品的单价：");
        Scanner scan = new Scanner(System.in);
        double price = scan.nextDouble();
        System.out.println("请输入商品的数量：");
        int number = scan.nextInt();
        double totalNumber = price * number;
        System.out.println("总价为："+totalNumber);
        int x=(int) (0.8*totalNumber/1);
        System.out.println("活动价为："+x);    
        System.out.println("付款：");
        double actualAmounts = scan.nextDouble();
        double change = actualAmounts - x;
        System.out.println("找回：" + change + "元");
    }
}

 

 

2.输入一个三位数，求个位，十位和百位。

package text1;
import java.util.Scanner;
public class HelloWorid{
         public static void main(String[] args) {
       System.out.println("请输入一个三位数：");
        Scanner input = new Scanner(System.in);
        int x=input.nextInt();
        int ge,shi,bai;
        ge=x%10;
        shi=(x%100)/10;
        bai=x/100;
        System.out.println("百位：" +bai+ " 十位：" +shi+ " 个位："+ge);
    }
}

 

 

3.输入大写字母，转成对应的小写字母

package text1;
import java.util.Scanner;
public class HelloWorid{
         public static void main(String[] args) {
        System.out.println("请输入一个大写字母：");
        Scanner input = new Scanner(System.in);
        String leter=input.next();
        String str11 = leter.toLowerCase();
        System.out.println("转换后： "+ str11);
    }
}

 

 

4.输入两个数，用三目运算符，输出较大数

package text1;
import java.util.Scanner;
public class HelloWorid{
         public static void main(String[] args) {
        System.out.println("请输入两个数字：");
        Scanner input = new Scanner(System.in);
        int a = input.nextInt();
        int b = input.nextInt();
        int x;
        x=a>b?a:b;
        System.out.println("较大数为： "+x);
    }
}