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View Compilation Error

0_0_29379137_4798\Main.java:1: 错误: 需要class, interface或enum
using namespace std;
^
0_0_29379137_4798\Main.java:3: 错误: 需要class, interface或enum
int main()
^
0_0_29379137_4798\Main.java:5: 错误: 需要class, interface或enum
	int M1,M2;string str;
	          ^
0_0_29379137_4798\Main.java:6: 错误: 需要class, interface或enum
	int R1,R2,R3;
	^
0_0_29379137_4798\Main.java:8: 错误: 需要class, interface或enum
	while(cin>>M1>>M2)
	^
0_0_29379137_4798\Main.java:11: 错误: 需要class, interface或enum
		cin>>str;
		^
0_0_29379137_4798\Main.java:12: 错误: 需要class, interface或enum
		for(int i=0;i<str.size();i++)
		^
0_0_29379137_4798\Main.java:12: 错误: 需要class, interface或enum
		for(int i=0;i<str.size();i++)
		            ^
0_0_29379137_4798\Main.java:12: 错误: 需要class, interface或enum
		for(int i=0;i<str.size();i++)
		                         ^
0_0_29379137_4798\Main.java:17: 错误: 需要class, interface或enum
				R1=M1;break;
				      ^
0_0_29379137_4798\Main.java:18: 错误: 需要class, interface或enum
			case'B':
			^
0_0_29379137_4798\Main.java:19: 错误: 需要class, interface或enum
				R2=M2;break;
				      ^
0_0_29379137_4798\Main.java:20: 错误: 需要class, interface或enum
			case'C':
			^
0_0_29379137_4798\Main.java:21: 错误: 需要class, interface或enum
				M1=R3;break;
				      ^
0_0_29379137_4798\Main.java:22: 错误: 需要class, interface或enum
			case'D':
			^
0_0_29379137_4798\Main.java:23: 错误: 需要class, interface或enum
				M2=R3;break;
				      ^
0_0_29379137_4798\Main.java:24: 错误: 需要class, interface或enum
			case'E':
			^
0_0_29379137_4798\Main.java:25: 错误: 需要class, interface或enum
				R3=R1+R2;break;
				         ^
0_0_29379137_4798\Main.java:26: 错误: 需要class, interface或enum
			case'F':
			^
0_0_29379137_4798\Main.java:27: 错误: 需要class, interface或enum
				R3=R1-R2;break;
				         ^
0_0_29379137_4798\Main.java:28: 错误: 需要class, interface或enum
			}
			^
0_0_29379137_4798\Main.java:31: 错误: 需要class, interface或enum
	}
	^
0_0_29379137_4798\Main.java:33: 错误: 需要class, interface或enum
}
^
23 个错误


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