3.19 第二次作业

二.
package hm;
/*
 * 计算1--1000的个个位数相加
 */
import java.util.Scanner;

public class Practice01 {

    public static void main(String[] args) {
        Scanner r= new Scanner(System.in);
        System.out.println("输入一个四位数");
        int a = r.nextInt();
        int g,s,b,q,sum;
        q= a/1000;
        b = a/100%10;
        s= a/10%10;
        g= a%10;
        sum = g+s+b+q;
        System.out.println(sum);

三.package hm;

import java.util.Scanner;

public class Practice02 {

    public static void main(String[] args) {
        Scanner r = new Scanner(System.in);
        System.out.println("输入华氏温度");
        double  H = r.nextDouble();
        double C = (H-32)*5/9;
        System.out.println("摄氏温度："+C);
        
    }

}

四.
package hm;
/*
 * 字符转换大小写
 */
public class Practice03 {

    public static void main(String[] args) {
        String a = "i love you";
        String A = a.toUpperCase();
        System.out.println("原字符串："+a);
        System.out.println("大写字符串："+A);
    }

}