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View Compilation Error

0_0_8019417_30811\Main.java:1: 需要为 class、interface 或 enum
public static void main(String[] args) {
              ^
0_0_8019417_30811\Main.java:6: 需要为 class、interface 或 enum
		sum[1] = 1;
		^
0_0_8019417_30811\Main.java:7: 需要为 class、interface 或 enum
		sum[2] = 2;
		^
0_0_8019417_30811\Main.java:8: 需要为 class、interface 或 enum
		sum[3] = 3;
		^
0_0_8019417_30811\Main.java:9: 需要为 class、interface 或 enum
       Scanner scan=new Scanner(System.in);
       ^
0_0_8019417_30811\Main.java:10: 需要为 class、interface 或 enum
		while(scan.hasNext()){
		^
0_0_8019417_30811\Main.java:15: 需要为 class、interface 或 enum
			if (0 < n && n < 50) 
			^
0_0_8019417_30811\Main.java:18: 需要为 class、interface 或 enum
				for (int i = 4; i < 50; i++) {
				                ^
0_0_8019417_30811\Main.java:18: 需要为 class、interface 或 enum
				for (int i = 4; i < 50; i++) {
				                        ^
0_0_8019417_30811\Main.java:22: 需要为 class、interface 或 enum
				}
				^
0_0_8019417_30811\Main.java:24: 需要为 class、interface 或 enum
			}else{
			^
0_0_8019417_30811\Main.java:26: 需要为 class、interface 或 enum
			}
			^
12 错误


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