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View Compilation Error

0_0_8319006_21649\Main.java:2: 类 Main60 是公共的,应在名为 Main60.java 的文件中声明
public class Main60
       ^
0_0_8319006_21649\Main.java:9: 找不到符号
符号: 类 lang
位置: 类 Main60
			lang n=sc.nextInt();
			^
0_0_8319006_21649\Main.java:10: 运算符 + 不能应用于 int,lang
			System.out.println((1+n)*n/2);
			                    ^
3 错误


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