3.19 第二次作业

 1 二.
 2 package hm;
 3 /*
 4  * 计算1--1000的个个位数相加
 5  */
 6 import java.util.Scanner;
 7 
 8 public class Practice01 {
 9 
10     public static void main(String[] args) {
11         Scanner r= new Scanner(System.in);
12         System.out.println("输入一个四位数");
13         int a = r.nextInt();
14         int g,s,b,q,sum;
15         q= a/1000;
16         b = a/100%10;
17         s= a/10%10;
18         g= a%10;
19         sum = g+s+b+q;
20         System.out.println(sum);
21 
22 三.package hm;
23 
24 import java.util.Scanner;
25 
26 public class Practice02 {
27 
28     public static void main(String[] args) {
29         Scanner r = new Scanner(System.in);
30         System.out.println("输入华氏温度");
31         double  H = r.nextDouble();
32         double C = (H-32)*5/9;
33         System.out.println("摄氏温度："+C);
34         
35     }
36 
37 }
38 
39 四.
40 package hm;
41 /*
42  * 字符转换大小写
43  */
44 public class Practice03 {
45 
46     public static void main(String[] args) {
47         String a = "i love you";
48         String A = a.toUpperCase();
49         System.out.println("原字符串："+a);
50         System.out.println("大写字符串："+A);
51     }
52 
53 }