编译原理(语法分析源代码).doc

#include#include#includechar prog80,token8;char ch;int syn,p,m=0,n,sum=0,kk=0;char *rwtab6=begin,if,then,while,do,end; void expression(); void factor(); void term(); void statement(); void yucu();void scaner()for(n=0;n=a&ch=A&ch=0&ch=a&ch=A&ch=Z)tokenm+=ch;ch=progp+;tokenm+=0;p-;syn=10;for(n=0;n=0&ch=0&ch32767)syn=-1;else switch(ch)case)syn=21;tokenm+=ch;else if(ch=)syn=22;tokenm+=ch;elsesyn=23;p-;break;case:m=0;tokenm+=ch;ch=progp+;if(ch=)syn=24;tokenm+=ch;elsesyn=20;p-;break;case:m=0;tokenm+=ch;ch=progp+;if(ch=)syn=18;tokenm+=ch;elsesyn=17;p-;break;case*:syn=15;token0=ch;break;case/:syn=16;token0=ch;break;case+:syn=13;token0=ch;break;case-:syn=14;token0=ch;break;case=:syn=25;token0=ch;break;case;:syn=26;token0=ch;break;case(:syn=27;token0=ch;break;case):syn=28;token0=ch;break;case#:syn=0;token0=ch;break;casen:syn=-2;break;default: syn=-1;break;void expression()term();while(syn=13|syn=14)scaner();term(); return;void factor()if(syn=10) scaner();else if(syn=11)scaner();else if(syn=27)scaner();expression();if(syn=28)scaner();elsecout输出)错误endl;kk=1;elsecout表达式错误endl;kk=1;return;void term()factor();while(syn=15|syn=16)scaner();factor();return;void statement()if(syn=10)scaner();if(syn=18)scaner();expression();elsecout赋值号错误endl;kk=1;elsecout语句错误endl;kk=1;return;void yucu()statement();while(syn=26)scaner();statement();return;void lrparser()if(syn=1)scaner();yucu();if(syn=6)scaner();if(syn=0&(kk=0)coutsuccessendl; else if(kk!=1) cout缺少end错误endl; else cout缺少begin错误endl;return;void main()p=0;coutPlease i