View Compilation Error

0_0_30257910_19924\Main.java:2: 错误: 需要class, interface或enum
 public static void main(String[] args) {
               ^
0_0_30257910_19924\Main.java:4: 错误: 需要class, interface或enum
    	 int a;
    	 ^
0_0_30257910_19924\Main.java:5: 错误: 需要class, interface或enum
    	 a=in.nextInt();
    	 ^
0_0_30257910_19924\Main.java:6: 错误: 需要class, interface或enum
    	 while(a>=1) {
    	 ^
0_0_30257910_19924\Main.java:8: 错误: 需要class, interface或enum
    		 int b;
    		 ^
0_0_30257910_19924\Main.java:9: 错误: 需要class, interface或enum
    		 int c;
    		 ^
0_0_30257910_19924\Main.java:10: 错误: 需要class, interface或enum
    		 b=on.nextInt();
    		 ^
0_0_30257910_19924\Main.java:11: 错误: 需要class, interface或enum
    		 c=on.nextInt();
    		 ^
0_0_30257910_19924\Main.java:12: 错误: 需要class, interface或enum
    		 System.out.println(b+c);
    		 ^
0_0_30257910_19924\Main.java:13: 错误: 需要class, interface或enum
    		 a=a-1;
    		 ^
0_0_30257910_19924\Main.java:14: 错误: 需要class, interface或enum
    	 }
    	 ^
11 个错误