编译原理实验三，四语义分析语义分析语义分析的例子变量的类型Scope—符号表四种scopeinttest(intc,intd);voidmain(){intc;strings;s="hello";c=test(4,5);Print(c);Print(s);}inttest(inta,intb){returna+b;}实验三要求实验四代码生成简单的例子DeclList->Type->VoidFormals->Constant->stringConstantExpr->ConstantExpr->ExprPrintStmt->Print(ExprList)Stmt->PrintStmtStmtList->StmtListStmtStmtBlock->{StmtList}FunctionDefn->Typeidentifier(Formals)StmtBlockDecl->FunctionDefnDeclList->DeclListDeclProgram->DeclList更复杂的表达式类，继承实验要求