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1、编译原理语法分析实验报告班级：11203105学号：1120310528姓名：陈向军词法分析器与语法分析器I.问题描述设计、编制、调试一个语法分析程序，并用它对词法分析程序所提供的单词序列进行语法检查和结构分析。ii.设计简要描述界面需求：为了更加形象的模拟过程，此实验使用图形界面。要求从图形界面上输入输入串，点击词法分析，可以将词法分析后识别的单词符号显示，点击语法分析，可以将语法分析的堆栈过程显示，并且显示结果（是否是符合文法的句子），清空则可以将所有置空。思路描述：一、设计构想：本实验决定编写一个简易C
2、语言的词法分析器和语法分析器。使其能够识别while，if等关键字，可以判断赋值语句、条件语句、循环语句。二、文法分析1、需要识别的关键字及其识别码有：{"break",1,"BREAK"},{"continue",2,"CONTINUE"},{"else",3,"ELSE"},{"float",4,"FLOAT"},{"for",5,"FOR"},{"if",6,"IF"},{"int",7,"INT"},{"return",8,"RETURN"},{"void",9,"VOID"},{"while",10
3、,"WHILE"},{"printf",41,"OUTPUT"},{"scanf",42,"INPUT"},{"main",43,"MAIN"},{"function",44,"function"}{"+",16,"PLUS"},{"-",17,"MINUS"},{"*",18,"MULTI"},{"/",19,"RDIV"},{"=",20,"ASSIGN"},{"<",21,"LT"},{">",22,"GT"},{"<=",23,"LE"},{">=",24,"GE"},{"!=",25,"NE"},{
4、"(",26,"LR_BRAC"},{")",27,"RR_BRAC"},{",",28,"COMMA"},{";",29,"SEMIC"},{"[",30,"LS_BRAC"},{"]",31,"RS_BRAC"},{"{",32,"LB_BRAC"},{"}",33,"RB_BRAC"},{"%",34,"REMAINDER"},{"&&",35,"AND"},{"
5、
6、",36,"OR"},{"!",37,"NOT"},{"++",38,"INC"},{"==",39,"EQ"},{"&",40,"ADD
7、R"}2、文法S'->S;S->voidmain(){declsstmts};S->funS;fun->funfun;fun->funtypefunctionid(fundecls){declsstmts};fundecls->fundecls,fundecl;fundecls->fundecl;fundecl->typeid;decls->declsdecl;decls->decl;decl->typeids@;type->float;type->int;funtype->float;funtype->in
8、t;ids->ids,N6id;ids->id;ids->id[num]={nums};nums->nums,num;nums->num;nums->xiao;stmts->stmtsstmt;stmts->stmt;stmt->returnexpr@;stmt->asgn@;stmt->iter;stmt->slct;stmt->{stmts};stmt->continue;stmt->break;expr->E;E->E+T;E->E-T;E->T;T->T*F;T->T/F;T->T%F;T->F;F-
9、>(E);F->num;F->xiao;F->id;F->id[expr];asgn->left=expr;asgn->left=funid(funcs);funid->id;funcs->funcs,func;funcs->func;func->id;func->num;left->id;left->id[expr];iter->for(asgn@M1rel@N4inc)N2stmt;iter->whileM1(rel)M2stmt;M1->$;M2->$;N1->$;N2->$;N3->$;N4->$;N
10、5->$;N6->$;rel->expropexpr;rel->!rel;rel->reloN3rel;op-><;op->>;op-><=;op->>=;op->==;op->!=;o->&&;o->
11、
12、;inc->left++;slct->if(rel)M1stmtN1elseM2stmt;stmt->printf(str)@;stmt->printf(str,N5ids)@;stmt->sca
