/*//主函数 int main() {
WordType word;
cout<<\请输入源程序序列:\ word=get_w();
while(word.pro!=\为自己设置的结束标志 { cout<<\，\“\”\ word=get_w(); };
return 0; }*/
WordType get_w() {
string str=\ int code;
WordType wordtmp; getch();//读一个字符 getBC();//去掉空白符
if(isLetter()){ //以字母开头 while(isLetter()||isDigit()){ str=concat(str); getch(); } retract(); code=Reserve(str); if(code==-1){wordtmp.code=0;wordtmp.pro=str;}//不是关键字 else{wordtmp.code=code;wordtmp.pro=str;}//是关键字 }
else if(isDigit()){ //以数字开头 while(isDigit()){ str=concat(str); getch(); } retract(); wordtmp.code=30; wordtmp.pro=str; } else if(ch=='(') {wordtmp.code=1;wordtmp.pro=\ else if(ch==')') {wordtmp.code=2;wordtmp.pro=\ else if(ch=='{') {wordtmp.code=3;wordtmp.pro=\
else if(ch=='}') {wordtmp.code=4;wordtmp.pro=\ else if(ch==';') {wordtmp.code=5;wordtmp.pro=\ else if(ch=='=') {wordtmp.code=6;wordtmp.pro=\ else if(ch=='+') {wordtmp.code=7;wordtmp.pro=\ else if(ch=='*') {wordtmp.code=8;wordtmp.pro=\ else if(ch=='>') {wordtmp.code=9;wordtmp.pro=\ else if(ch=='<') {wordtmp.code=10;wordtmp.pro=\ else if(ch==',') {wordtmp.code=11;wordtmp.pro=\ else if(ch=='\\'') {wordtmp.code=12;wordtmp.pro=\ else if(ch=='-') {wordtmp.code=13;wordtmp.pro=\ else if(ch=='/') {wordtmp.code=14;wordtmp.pro=\ else if(ch=='#') {wordtmp.code=15;wordtmp.pro=\ else if(ch=='|') {wordtmp.code=16;wordtmp.pro=\
else {wordtmp.code=100;wordtmp.pro=ch;}
return wordtmp; }
void getch(){
if(flag==0) //没有回退的字符 ch=getchar();
else //有回退字符，用回退字符，并设置标志 flag=0; }
void getBC(){
while(ch==' '||ch=='\\t'||ch=='\\n') ch=getchar(); }
bool isLetter(){
if(ch>='a'&&ch<='z'||ch>='A'&&ch<='Z') return true; else return false; }
bool isDigit(){
if(ch>='0'&&ch<='9') return true; else return false; }
string concat(string str){ return str+ch; }
void retract(){
flag=1; }
int Reserve(string str){ int i;
for(i=0;i<=8;i++){ if(codestring[i]==str) //是某个关键字，返回对应的编码 return codebook[i]; }
if(i==9) //不是关键字 return -1; }
【LR.cpp】
#include
#include\#include\#include\#include%using namespace std;
void process(){ int stepNum=1; int topStat;
Stack_num statusSTK; //状态栈 Stack_str symbolSTK; //符号栈 Stack_num valueSTK; //值栈 WordType word;
Table_action actionTAB; //行为表 Table_go goTAB; //转向表 cout<<\请输入源程序，以#结束：\ word=get_w();
//总控程序初始化操作 symbolSTK.push(\ statusSTK.push(0); valueSTK.push(0);
cout<<\步骤\\t状态栈\\t符号栈\\t值栈\\t当前词\\t动作\\t转向\ //分析 while(1) { topStat=statusSTK.getTop(); //当前状态栈顶
string act=actionTAB.getCell(topStat,word.code);//根据状态栈顶和当前单词查到的动作 //输出 cout< if(sn==\{ statusSTK.pop();statusSTK.pop();statusSTK.pop(); symbolSTK.pop();symbolSTK.pop();symbolSTK.pop(); symbolSTK.push(\ int right_digit=valueSTK.pop(); valueSTK.pop(); int left_digit=valueSTK.pop(); int new_value=left_digit+right_digit; valueSTK.push(new_value); } else if(sn==\{ statusSTK.pop();statusSTK.pop();statusSTK.pop(); symbolSTK.pop();symbolSTK.pop();symbolSTK.pop(); symbolSTK.push(\ int right_digit=valueSTK.pop(); valueSTK.pop(); int left_digit=valueSTK.pop(); int new_value=left_digit-right_digit; valueSTK.push(new_value); } else if(sn==\{ statusSTK.pop();statusSTK.pop();statusSTK.pop(); symbolSTK.pop();symbolSTK.pop();symbolSTK.pop(); symbolSTK.push(\ int right_digit=valueSTK.pop(); valueSTK.pop(); int left_digit=valueSTK.pop(); int new_value=left_digit*right_digit; valueSTK.push(new_value); } else if(sn==\{ statusSTK.pop();statusSTK.pop();statusSTK.pop(); symbolSTK.pop();symbolSTK.pop();symbolSTK.pop(); symbolSTK.push(\ int right_digit=valueSTK.pop(); valueSTK.pop(); int left_digit=valueSTK.pop(); int new_value=left_digit/right_digit; valueSTK.push(new_value); }