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当我打字java AssignStatement
为什么我在解析语句时从使用javacc工具的用户输入错误的结果?
a=10+20*30
它要求我输入一个多语句后,我得到了
语法检查失败
如何通过采取从用户或输入文件呢?下面是我的源代码:
PARSER_BEGIN(AssignStatement)
public class AssignStatement
{
public static void main(String s[])
{
try
{
AssignStatement as=new AssignStatement(System.in);
as.StartSymbol();
System.out.println("Syntax checking successfully");
}
catch(Throwable e)
{
System.out.println("Syntex checking failed");
e.getMessage();
}
}
}
PARSER_END(AssignStatement)
SKIP: {"" | "\t" | "\n" | "\r" }
TOKEN:{ "(" | ")" | "+" | "*" | ":="| <NUM: (["0"-"9"])+> | <ID:(["0"-"9"])+>
}
void StartSymbol(): {}
{
(AStmt())*<EOF>
}
void AStmt(): {}
{
LOOKAHEAD(2) <ID> "=" AStmt()
| Term() ("+" Term())*
}
void Term(): {}
{
Factor() ("*" Factor())*
}
void Factor(): {}
{
<NUM>
| <ID>
| "(" AStmt() ")"
}
我做了以下更正,因为你告诉我,现在我收到以下错误,我无法找到我的AssignStatement.jj文件中我输入后:C:\ javaccprog \ AssignStatement> java AssignStatement“a = 10 + 20 * 30“错误来自Syntex检查第1行第1列的failedLexical错误。遇到:”\“”(34),在:“ –