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View Compilation Error

0_0_29379213_18081\Main.java:1: 错误: 需要class, interface或enum
	using namespace std{
	^
0_0_29379213_18081\Main.java:3: 错误: 需要class, interface或enum
			int M1 M2; string str;
			           ^
0_0_29379213_18081\Main.java:4: 错误: 需要class, interface或enum
			int R1 R2 R3;
			^
0_0_29379213_18081\Main.java:6: 错误: 需要class, interface或enum
			while(cin=M1=M2){
			^
0_0_29379213_18081\Main.java:8: 错误: 需要class, interface或enum
				cin=str;
				^
0_0_29379213_18081\Main.java:9: 错误: 需要class, interface或enum
				for(int i=0;i<str.size();i++){
				^
0_0_29379213_18081\Main.java:9: 错误: 需要class, interface或enum
				for(int i=0;i<str.size();i++){
				            ^
0_0_29379213_18081\Main.java:9: 错误: 需要class, interface或enum
				for(int i=0;i<str.size();i++){
				                         ^
0_0_29379213_18081\Main.java:12: 错误: 需要class, interface或enum
						R1=M1;break;
						      ^
0_0_29379213_18081\Main.java:13: 错误: 需要class, interface或enum
					case'B':
					^
0_0_29379213_18081\Main.java:14: 错误: 需要class, interface或enum
						R2=M2;break;
						      ^
0_0_29379213_18081\Main.java:15: 错误: 需要class, interface或enum
					case'C':
					^
0_0_29379213_18081\Main.java:16: 错误: 需要class, interface或enum
						M1=R3;break;
						      ^
0_0_29379213_18081\Main.java:17: 错误: 需要class, interface或enum
					case'D':
					^
0_0_29379213_18081\Main.java:18: 错误: 需要class, interface或enum
						M2=R3;break;
						      ^
0_0_29379213_18081\Main.java:19: 错误: 需要class, interface或enum
					case'E':
					^
0_0_29379213_18081\Main.java:20: 错误: 需要class, interface或enum
						R3=R1+R2;break;
						         ^
0_0_29379213_18081\Main.java:21: 错误: 需要class, interface或enum
					case'F':
					^
0_0_29379213_18081\Main.java:22: 错误: 需要class, interface或enum
						R3=R1-R2;break;
						         ^
0_0_29379213_18081\Main.java:23: 错误: 需要class, interface或enum
					}
					^
0_0_29379213_18081\Main.java:27: 错误: 需要class, interface或enum
			}
			^
0_0_29379213_18081\Main.java:29: 错误: 需要class, interface或enum
		}
		^
22 个错误


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