Java第三次作业

课堂练习1：输入2个数，交换后输出。

package two;

import java.util.Scanner;

public class aa {

    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        System.out.println("输入a的值");
        int a=input.nextInt();
        System.out.println("输入b的值");
        int b=input.nextInt();
        int c;
        c=a;
        a=b;
        b=c;
        System.out.println("交换后a="+a);
        System.out.println("交换后b="+b);

    }

}

课堂练习2：输入两个数，求平方和。

package two;

import java.util.Scanner;

public class bb {

    public static void main(String[] args) {
    Scanner input=new Scanner(System.in);
     System.out.println("输入a的值");
        int a=input.nextInt();
        System.out.println("输入b的值");
        int b=input.nextInt();
        int c,d;
        c=a*a;
        d=b*b;
        System.out.println(c);
        System.out.println(d);

    }

}

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 two;

import java.util.Scanner;

public class cc {

    public static void main(String[] args) {
    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();
    System.out.println("输入付款金额");
    double d=input.nextDouble();
    double all;
    all=a*b;
    System.out.println("八折抹零后=");
    double c=all*0.8;
    double e;
    e=Math.round(c);
    System.out.println(e);
    System.out.println("找零=");
    double f;
    f=d-e;
    System.out.println(f);

    }

}

2..输入一个三位数，求个位，十位和百位。

package two;

import java.util.Scanner;

public class dd {

    public static void main(String[] args) {
    Scanner input=new Scanner(System.in);
    System.out.println("输入一个三位数");
    int n=input.nextInt();
    System.out.println("个位");
    int x=n%10;
    System.out.println(x);
    System.out.println("十位");
    int y=n/10%10;
    System.out.println(y);
    System.out.println("百位");
    int z=n/100;
    System.out.println(z);

    }

}

3.输入大写字母，转成对应的小写字母

package two;

import java.util.Scanner;

public class ee {

    public static void main(String[] args) {
    Scanner input=new Scanner(System.in);
    System.out.println("输入大写字母");
    char d=input.next().charAt(0);
    System.out.println((char)(d+32));

    }

}

4.输入2个数，用三目运算符，输出较大数

package two;

import java.util.Scanner;

public class ff {

    public static void main(String[] args) {
    Scanner input=new Scanner(System.in);
    System.out.println("输入数a");
    double a=input.nextDouble();
    System.out.println("输入数b");
    double b=input.nextDouble();
    double max=a>b?a:b;
    System.out.println("较大值为"+max);

    }

}