第二次上机作业

package week2;

public class Week1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double r = 4.5;
        double s;
        s = r * r * 3.14;
        System.out.println("圆的面积为" + s);
    }

}

 

 

package week2;

public class Week2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double hua = 50;
        double she;
        she = (hua - 32) * 5 / 9;
        System.out.println("从华氏度变成摄氏度为" + she);
        double shes = 60;
        double huas;
        huas = shes * 9 / 5 + 32;
        System.out.println("从摄氏度变成华氏度为" + huas);
    }

}

package week2;

public class Week4 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a = 1;
        int b = 2;
        int c;
        c = a;
        a = b;
        b = c;
        System.out.println(a);
        System.out.println(b);
    }

}

 

package week2;

public class Week5 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a = 12345;
        int b;
        b = a / 100 * 100;
        System.out.println(b);
    }

}

 

 

package second;

import java.util.*;

public class Second3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("请输入一个0~1000的整数");
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b,c,d,sum;
        b=a%10;
        c=a%100/10;
        d=a/100;
        sum=b+c+d;
        System.out.println("结果为"+sum);


    }

}

 

 

 

 

package week2;

public class Week6 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        char c = 'a';
        char e = 'A';
        System.out.println((char) (c - 32));
        System.out.println((char) (e + 32));
    }
}