编译原理课程设计(词法分析，语法分析，语义分析，代码生成）#include<cstdio>#include<iostream>#include<cstdlib>#include<fstream>#include<string>#include<cmath>using namespace std;/************************************************/struct token// token {int code;//int num;//token *next;};token *token_head,*token_tail;//tokenstruct str// string {int num;//string word;//str *next;};str *string_head,*string_tail;//stringstruct ivan// {char left;//string right;//int len;// };ivan css[20];// 20 struct pank// action {char sr;//int state;// };pank action[46][18];//action int go_to[46][11];// go_to struct ike// {ike *pre;int num;//int word;//ike *next;};ike *stack_head,*stack_tail;// struct L//{int k;string op;//string op1;//string op2;//string result;//L *next;//L *Ltrue;//trueL *Lfalse;//false};L *L_four_head,*L_four_tail,*L_true_head,*L_false_head;//truefalse struct symb//{string word;//int addr;//symb *next;};symb *symb_head,*symb_tail;///************************************************/void scan();//void cifa_main();//int judge(char ch);// void out1(char ch);//token.txtvoid out3(char ch,string word);//string.txt void input1(token*temp);//token void input3(str *temp);//string void output();// void outfile();///************************************************/void yufa_main();//void yufa_initialize();// int yufa_SLR1(int a);// int ID1(inta);//action string ID10(int i);//int ID2(char ch);//go_toint ID20(char ch);//char ID21(int j);//void add(ike *temp);//ike void del();//ike/************************************************/void yuyi_main(int m);//void add_L_four(L *temp);// void add_L_true(L *temp);//true void add_L_false(L *temp);//false void add_symb(symb *temp);// void output_yuyi();// string newop(int m);//string id_numtoname(int num);// int lookup(string m);///************************************************/FILE *fp;//int wordcount;//int err;//int nl;//int yuyi_linshi;//stringE_name,T_name,F_name,M_name,id_name,id1_name,id2_name,errword;// int id_num,id1_num,id2_num,id_left,id_while,id_then,id_do;// /******************************************************/int main(){cout<<"************************"<<endl;cout<<"* *"<<endl;cout<<"* *"<<endl;cout<<"* *"<<endl;cout<<"* *"<<endl;cout<<"************************"<<endl;cifa_main();//yufa_main();//output_yuyi();//cout<<endl;system("pause");return(0);}/******************************************************/ void cifa_main(){token_head=new token;token_head->next=NULL;token_tail=new token;token_tail->next=NULL;string_head=new str;string_head->next=NULL;string_tail=new str;string_tail->next=NULL;//L_four_head=new L;L_four_head->next=NULL;L_four_tail=new L;L_four_tail->k=0;L_four_tail->next=NULL;L_true_head=new L;L_true_head->Ltrue=NULL;L_false_head=new L;L_false_head->Lfalse=NULL;symb_head=new symb;symb_head->next=NULL;symb_tail=new symb;symb_tail->next=NULL;yuyi_linshi=-1;id_num=0;wordcount=0;//err=0;//nl=1;//scan();if(err==0){char m;output();cout<<"!"<<endl<<endl<<" y";cin>>m;cout<<endl;if(m=='y'){outfile();cout<<"token.txtsting.txt"<<endl;cout<<endl;}}}void scan(){cout<<endl;system("pause");cout<<endl;char ch;string word;char document[50];int flag=0;cout<<":";cin>>document;cout<<endl;cout<<"************************"<<endl; cout<<"* *"<<endl;cout<<"************************"<<endl; if((fp=fopen(document,"rt"))==NULL) {err=1;cout<<"!"<<endl;return;}while(!feof(fp)){word="";ch=fgetc(fp);flag=judge(ch);if(flag==1)out1(ch);else if(flag==3)out3(ch,word);else if(flag==4 || flag==5 ||flag==6) continue;else{cout<<nl<<" "<<":! "<<ch<<endl;err=1;}}fclose(fp);}int judge(char ch){int flag=0;if(ch=='=' || ch=='+' || ch=='*' || ch=='>' || ch==':' || ch==';' || ch=='{' || ch=='}' || ch=='(' || ch==')')flag=1;//else if(('a'<=ch && ch<='z') || ('A'<=ch && ch<='Z'))flag=3;//else if(ch==' ')flag=4;//else if(feof(fp))flag=5;//else if(ch=='\n'){flag=6;//nl++;}elseflag=0;//return(flag);}void out1(char ch){int id;switch(ch){case '=' : id=1;break;case '+' : id=2;break;case '*' : id=3;break;case '>' : id=4;break;case ':' : id=5;break;case ';' : id=6;break;case '{' : id=7;break;case '}' : id=8;break;case '(' : id=9;break;case ')' : id=10;break;// default : id=0;}token *temp;temp=new token;temp->code=id;temp->num=-1;temp->next=NULL;input1(temp);return;}void out3(char ch,string word) {token *temp;temp=new token;temp->code=-1;temp->num=-1;temp->next=NULL;str *temp1;temp1=new str;temp1->num=-1;temp1->word="";temp1->next=NULL;int flag=0;word=word+ch;ch=fgetc(fp);flag=judge(ch);if(flag==1 || flag==4 || flag==5 || flag==6){if(word=="and" || word=="if" || word=="then" || word=="while" || word=="do" || word=="int"){if(word=="and")temp->code=31;else if(word=="if")temp->code=32;else if(word=="then")temp->code=33;else if(word=="while")temp->code=35;else if(word=="do")temp->code=36;else if(word=="int")temp->code=37;//input1(temp);if(flag==1)out1(ch);else if(flag==4 || flag==5 || flag==6) return;}else if(flag==1){wordcount++;temp->code=25;temp->num=wordcount;input1(temp);temp1->num=wordcount;temp1->word=word;input3(temp1);out1(ch);}else if(flag==4 || flag==5 || flag==6) {wordcount++;temp->code=25;temp->num=wordcount;input1(temp);temp1->num=wordcount;temp1->word=word;input3(temp1);}return;}else if(flag==2 || flag==3)out3(ch,word);//else{err=1;cout<<nl<<" "<<":! "<<ch<<endl; return;}}void input1(token *temp) {if(token_head->next == NULL) {token_head->next=temp;token_tail->next=temp;}else{token_tail->next->next=temp; token_tail->next=temp;}}void input3(str *temp) {if(string_head->next == NULL) {string_head->next=temp;string_tail->next=temp;}else{string_tail->next->next=temp; string_tail->next=temp;}}void output(){cout<<"token"<<endl;token *temp1;temp1=new token;temp1=token_head->next;while(temp1!=NULL){cout<<temp1->code;if(temp1->num == -1){cout<<endl;}else{cout<<" "<<temp1->num<<endl;}temp1=temp1->next;}cout<<""<<endl;str *temp3;temp3=new str;temp3=string_head->next;while(temp3!=NULL){cout<<temp3->num<<" "<<temp3->word<<endl; temp3=temp3->next;}}void outfile(){ofstream fout1("token.txt");//ofstream fout3("string.txt");token *temp1;temp1=new token;temp1=token_head->next;while(temp1!=NULL){fout1<<temp1->code;if(temp1->num == -1)fout1<<endl;elsefout1<<" "<<temp1->num<<endl;temp1=temp1->next;}str *temp3;temp3=new str;temp3=string_head->next;while(temp3!=NULL){fout3<<temp3->num<<" "<<temp3->word<<endl; temp3=temp3->next;}}/******************************************************/ void yufa_main(){if(err==0){system("pause");cout<<endl;cout<<"************************"<<endl;cout<<"* *"<<endl;cout<<"************************"<<endl;yufa_initialize();//token *temp;temp=new token;temp=token_head->next;int p,q;p=0;q=0;cout<<""<<endl;while(temp!=NULL){int w;w=ID1(temp->code);p=yufa_SLR1(w);if(p==1) break;if(p==0)temp=temp->next;if(temp==NULL) q=1;}//if(q==1)while(1){p=yufa_SLR1(17);if(p==3) break;}//$}}void yufa_initialize() { stack_head=new ike;stack_tail=new ike;stack_head->pre=NULL;stack_head->next=stack_tail; stack_head->num=0;stack_head->word='!';stack_tail->pre=stack_head; stack_tail->next=NULL;//css[0].left='Q';css[0].right="P";css[1].left='P';css[1].right="id()L;R"; css[2].left='L';css[2].right="L;D";css[3].left='L';css[3].right="D";css[4].left='D';css[4].right="id:int"; css[5].left='E';css[5].right="E+T";css[6].left='E';css[6].right="T";css[7].left='T';css[7].right="T*F";css[8].left='T';css[8].right="F";css[9].left='F';css[9].right="(E)";css[10].left='F';css[10].right="id";css[11].left='B';css[11].right="B and B"; css[12].left='B';css[12].right="id>id"; css[13].left='M';css[13].right="id=E";css[14].left='S';css[14].right="if B then M"; css[15].left='S';css[15].right="while B do M"; css[16].left='S';css[16].right="M";css[17].left='N';css[17].right="N;S";css[18].left='N';css[18].right="S";css[19].left='R';css[19].right="{N}";int i,j;for(i=0;i<20;i++){char *css_len;css_len=&css[i].right[0];css[i].len=strlen(css_len); }css[1].len=6;css[4].len=3;css[10].len=1;css[11].len=3;css[12].len=3;css[13].len=3;css[14].len=4;css[15].len=4;//for(i=0;i<46;i++){for(j=0;j<18;j++)action[i][j].sr='#';}//actionfor(i=0;i<46;i++){for(j=0;j<11;j++)go_to[i][j]=-1;}//go_to/****************************actiongo_to************************/ action[0][0].sr='s';action[0][0].state=2;action[1][17].sr='@';//action[2][1].sr='s';action[2][1].state=3;action[3][2].sr='s';action[3][2].state=4;action[4][0].sr='s';action[4][0].state=5;action[5][4].sr='s';action[5][4].state=6;action[6][11].sr='s';action[6][11].state=7;action[7][3].sr='r';action[7][3].state=4;action[8][3].sr='r';action[8][3].state=3;action[9][3].sr='s';action[9][3].state=10; action[10][0].sr='s';action[10][0].state=5; action[10][9].sr='s';action[10][9].state=13; action[11][17].sr='r';action[11][17].state=1; action[12][3].sr='r';action[12][3].state=2; action[13][0].sr='s';action[13][0].state=14; action[13][13].sr='s';action[13][13].state=23; action[13][15].sr='s';action[13][15].state=27; action[14][8].sr='s';action[14][8].state=15; action[15][0].sr='s';action[15][0].state=36; action[15][1].sr='s';action[15][1].state=41; action[16][6].sr='s';action[16][6].state=43; action[16][3].sr='r';action[16][3].state=13; action[16][10].sr='r';action[16][10].state=13; action[17][3].sr='s';action[17][3].state=19; action[17][10].sr='s';action[17][10].state=18; action[18][17].sr='r';action[18][17].state=19; action[19][0].sr='s';action[19][0].state=14; action[19][13].sr='s';action[19][13].state=23; action[19][15].sr='s';action[19][15].state=27; action[20][3].sr='r';action[20][3].state=17; action[20][10].sr='r';action[20][10].state=17; action[21][3].sr='r';action[21][3].state=18; action[21][10].sr='r';action[21][10].state=18;action[22][3].sr='r';action[22][3].state=16; action[22][10].sr='r';action[22][10].state=16; action[23][0].sr='s';action[23][0].state=31; action[24][12].sr='s';action[24][12].state=34; action[24][14].sr='s';action[24][14].state=25; action[25][0].sr='s';action[25][0].state=14; action[26][3].sr='r';action[26][3].state=14; action[26][10].sr='r';action[26][10].state=14; action[27][0].sr='s';action[27][0].state=31; action[28][12].sr='s';action[28][12].state=34; action[28][16].sr='s';action[28][16].state=29; action[29][0].sr='s';action[29][0].state=14; action[30][3].sr='r';action[30][3].state=15; action[30][10].sr='r';action[30][10].state=15; action[31][7].sr='s';action[31][7].state=32; action[32][0].sr='s';action[32][0].state=33; action[33][12].sr='r';action[33][12].state=12; action[33][14].sr='r';action[33][14].state=12; action[33][16].sr='r';action[33][16].state=12; action[34][0].sr='s';action[34][0].state=31; action[35][12].sr='r';action[35][12].state=11; action[35][14].sr='r';action[35][14].state=11; action[35][16].sr='r';action[35][16].state=11; action[36][2].sr='r';action[36][2].state=10;action[36][3].sr='r';action[36][3].state=10; action[36][5].sr='r';action[36][5].state=10; action[36][6].sr='r';action[36][6].state=10; action[36][10].sr='r';action[36][10].state=10; action[37][2].sr='r';action[37][2].state=8; action[37][3].sr='r';action[37][3].state=8; action[37][5].sr='r';action[37][5].state=8; action[37][6].sr='r';action[37][6].state=8; action[37][10].sr='r';action[37][10].state=8; action[38][2].sr='r';action[38][2].state=6; action[38][3].sr='r';action[38][3].state=6; action[38][5].sr='s';action[38][5].state=39; action[38][6].sr='r';action[38][6].state=6; action[38][10].sr='r';action[38][10].state=6; action[39][0].sr='s';action[39][0].state=36; action[39][1].sr='s';action[39][1].state=41; action[40][2].sr='r';action[40][2].state=7; action[40][3].sr='r';action[40][3].state=7; action[40][5].sr='r';action[40][5].state=7; action[40][6].sr='r';action[40][6].state=7; action[40][10].sr='r';action[40][10].state=7; action[41][0].sr='s';action[41][0].state=36; action[41][1].sr='s';action[41][1].state=41; action[42][2].sr='s';action[42][2].state=45;action[42][6].sr='s';action[42][6].state=43;action[43][0].sr='s';action[43][0].state=36;action[43][1].sr='s';action[43][1].state=41;action[44][2].sr='r';action[44][2].state=5;action[44][3].sr='r';action[44][3].state=5;action[44][5].sr='s';action[44][5].state=39;action[44][6].sr='r';action[44][6].state=5;action[44][10].sr='r';action[44][10].state=5;action[45][2].sr='r';action[45][2].state=9;action[45][3].sr='r';action[45][3].state=9;action[45][5].sr='r';action[45][5].state=9;action[45][6].sr='r';action[45][6].state=9;action[45][10].sr='r';action[45][10].state=9;go_to[0][0]=1;go_to[4][1]=8;go_to[4][9]=9;go_to[10][1]=12;go_to[10][ 2]=11;go_to[13][7]=22;go_to[13][8]=21;go_to[13][10]=17;go_to[15][3]=16;go_to[15][4]=38;go_to[15][5]=37;go_to[19][7]=20;go_t o[19][8]=20;go_to[23][6]=24;go_to[25][7]=26;go_to[27][6]=28;go_to[29][7]=30;go_to[34][6]=35;go_to[39][5]=40;go_to[41][3]=42;go_t o[41][4]=38;go_to[41][5]=37;go_to[43][4]=44;go_to[43][5]=37;/****************************actiongo_to************************/ }int ID1(int i)//action {int j;j=-1;if(i==25) {j=0;id_num++;}//if(i==1) {j=8,id_left=id_num;}//if(i==2) j=6;if(i==3) j=5;if(i==4) j=7;if(i==5) j=4;if(i==6) j=3;if(i==7) j=9;if(i==8) j=10;if(i==9) j=1;if(i==10) j=2;if(i==31) j=12;if(i==32) j=13;if(i==33) {j=14;id_then=L_four_tail->k+1;}//ifthenif(i==35) {j=15;id_while=L_four_tail->k+1;}//whilewhile if(i==36) {j=16;id_do=L_four_tail->k+1;}//whiledoif(i==37) j=11;return(j);}string ID10(int i)//{string ch;if(i==0) ch="id";if(i==1) ch="(";if(i==2) ch=")";if(i==3) ch=";";if(i==4) ch=":";if(i==5) ch="*";if(i==6) ch="+";if(i==7) ch=">";if(i==8) ch="=";if(i==9) ch="{";if(i==10) ch="}";if(i==11) ch="int";if(i==12) ch="and";if(i==13) ch="if";if(i==14) ch="then";if(i==15) ch="while"; if(i==16) ch="do";if(i==17) ch="$";return(ch);}int ID2(char ch)//go_to {int j;j=-1;if(ch=='P') j=0;if(ch=='D') j=1;if(ch=='R') j=2;if(ch=='E') j=3;if(ch=='T') j=4;if(ch=='F') j=5;if(ch=='B') j=6;if(ch=='M') j=7;if(ch=='S') j=8;if(ch=='L') j=9;if(ch=='N') j=10; return(j);}int ID20(char ch)// {int j;j=-1;if(ch=='P') j=100; if(ch=='D') j=101; if(ch=='R') j=102; if(ch=='E') j=103; if(ch=='T') j=104; if(ch=='F') j=105;if(ch=='B') j=106;if(ch=='M') j=107;if(ch=='S') j=108;if(ch=='L') j=109;if(ch=='N') j=1010;return(j);}char ID21(int j)//{char ch;if(j==100 || j==0) ch='P'; if(j==101 || j==1) ch='D'; if(j==102 || j==2) ch='R'; if(j==103 || j==3) ch='E'; if(j==104 || j==4) ch='T'; if(j==105 || j==5) ch='F'; if(j==106 || j==6) ch='B'; if(j==107 || j==7) ch='M'; if(j==108 || j==8) ch='S'; if(j==109 || j==9) ch='L'; if(j==1010 || j==10) ch='N'; return(ch);}void add(ike *temp)//{if(stack_head->next==stack_tail){temp->pre=stack_head;temp->next=stack_tail;stack_head->next=temp;stack_tail->pre=temp;}else{temp->pre=stack_tail->pre;temp->next=stack_tail;stack_tail->pre->next=temp;stack_tail->pre=temp;}}void del()//{stack_tail->pre->pre->next=stack_tail; stack_tail->pre=stack_tail->pre->pre; }int yufa_SLR1(int w){/*cout<<""<<ID10(w)<<" ";*/int i,flag=0,state_temp;//flag01,23char sr_temp;sr_temp=action[stack_tail->pre->num][w].sr;//state_temp=action[stack_tail->pre->num][w].state;// if(sr_temp=='#')//{flag=1;err=3;cout<<"!"<<endl;}else if(sr_temp=='s')//{ike *temp;temp=new ike;temp->next=NULL;temp->pre=NULL;temp->word=w;temp->num=state_temp;add(temp);cout/*<<""*/<<sr_temp<<state_temp<<" "/*<<""<<stack_tail->pre->num<<" "<<""<<ID10(stack_tail->pre->word)*/<<endl;flag=0;}else if(sr_temp=='r')//{int p=ID2(css[state_temp].left);int q=css[state_temp].len;for(i=0;i<q;i++)del();ike *temp;temp=new ike;temp->next=NULL;temp->pre=NULL;temp->word=ID20(css[state_temp].left);temp->num=go_to[stack_tail->pre->num][p];//go_toadd(temp);cout/*<<""*/<<sr_temp<<state_temp<<" "<<css[state_temp].left<<""<<css[state_temp].right<<" "/*<<""<<stack_tail->pre->num<<" "<<""<<ID21(stack_tail->pre->word)*/<<endl;flag=2;yuyi_main(state_temp);//}else if(sr_temp=='@')//{cout<<"END"/*<<""<<sr_temp<<state_temp*/<<""<<css[state_temp].left<<""<<css[state_temp].right<<" "/*<<""<<stack_tail->pre->num<<" "<<""<<ID21(stack_tail->pre->word)*/<<endl;flag=3;cout<<"!"<<endl;}else//{flag=1;err=3;cout<<"!"<<endl;}return(flag);}/******************************************************/ void yuyi_main(int m){L *temp;int k;k=1;temp=new L;temp->op=" ";temp->op1=" ";temp->op2=" ";temp->result="";temp->next=NULL;temp->Ltrue=NULL;temp->Lfalse=NULL;if(m==4)//{symb *Stemp;Stemp=new symb;id_name=id_numtoname(id_num); Stemp->word=id_name;Stemp->next=NULL;add_symb(Stemp);}if(m==5)//EE+T{temp->op="+";temp->op1=E_name;temp->op2=T_name;yuyi_linshi++;//E_name="t"+newop(yuyi_linshi); temp->result=E_name;add_L_four(temp);//}if(m==6)//ET{E_name=T_name;}if(m==7)//TT*F{temp->op="*";temp->op1=T_name;temp->op2=F_name;yuyi_linshi++;//T_name="t"+newop(yuyi_linshi); temp->result=T_name;add_L_four(temp);//}if(m==8)//TF{T_name=F_name;}if(m==9)//F(E){F_name=E_name;}if(m==10)//Fid{id_name=id_numtoname(id_num); F_name=id_name;k=lookup(id_name);//if(k==0){err=2;errword=id_name;return;}}if(m==12)//Bid>id{temp->op="J>";id1_num=id_num-1;id1_name=id_numtoname(id1_num); k=lookup(id1_name);//if(k==0){err=2;errword=id1_name;return;}id2_num=id_num;id2_name=id_numtoname(id2_num); k=lookup(id2_name);//if(k==0){err=2;errword=id2_name;return;}temp->result="-1";temp->op1=id1_name;temp->op2=id2_name;add_L_four(temp);//add_L_true(temp);//trueL *temp2;temp2=new L;temp2->op="J";temp2->op1=" ";temp2->op2=" ";temp2->result="-1";add_L_four(temp2);//add_L_false(temp2);//false}if(m==13)//Mid=E{temp->op="=";temp->op1=E_name;temp->op2=" ";id_name=id_numtoname(id_left);temp->result=id_name;add_L_four(temp);//yuyi_linshi=-1;//}if(m==14)//Sif B then M{int a;a=id_then;temp=L_true_head->Ltrue;while(temp!=NULL){temp->result="L"+newop(a);a=temp->k;temp=temp->Ltrue;}a=L_four_tail->k+1;temp=L_false_head->Lfalse;while(temp!=NULL){temp->result="L"+newop(a);temp=temp->Lfalse;}L_true_head->Ltrue=NULL;L_false_head->Lfalse=NULL;//truefalse}if(m==15)//Swhile B do M {int a;a=id_do;temp=L_true_head->Ltrue; while(temp!=NULL){temp->result="L"+newop(a); a=temp->k;temp=temp->Ltrue;}a=L_four_tail->k+2;temp=L_false_head->Lfalse; while(temp!=NULL){temp->result="L"+newop(a); temp=temp->Lfalse;}L *temp1;temp1=new L;temp1->op="J";temp1->op1=" ";temp1->op2=" ";temp1->next=NULL;temp1->result="L"+newop(id_while); add_L_four(temp1);//L_true_head->Ltrue=NULL;L_false_head->Lfalse=NULL;//truefalse }}string newop(int m)//{int shang,yushu;string chuan,chuan1;shang=m;chuan="";while(1){yushu=shang%10;chuan=chuan+char(48+yushu);shang=shang/10;if(shang==0)break;}int i;char *ch;ch=&chuan[0];chuan1="";for(i=strlen(ch)-1;i>=0;i--)chuan1=chuan1+chuan[i];return(chuan1);}void add_L_four(L *temp)//{temp->k=L_four_tail->k+1;if(L_four_head->next == NULL){L_four_head->next=temp;L_four_tail->next=temp;}else{L_four_tail->next->next=temp;L_four_tail->next=temp;}L_four_tail->k=L_four_tail->next->k; } void add_L_true(L *temp)//true{temp->Ltrue=L_true_head->Ltrue;L_true_head->Ltrue=temp;}void add_L_false(L *temp)//false {temp->Lfalse=L_false_head->Lfalse; L_false_head->Lfalse=temp;}void add_symb(symb *temp)//{if(symb_head->next == NULL){temp->addr=0;symb_head->next=temp;symb_tail->next=temp;}else{temp->addr=symb_tail->next->addr+4; symb_tail->next->next=temp;symb_tail->next=temp;}}void output_yuyi(){if(err==0)//{cout<<endl;system("pause");cout<<endl;cout<<"************************"<<endl;cout<<"* *"<<endl;cout<<"************************"<<endl;cout<<""<<endl;L *temp;temp=L_four_head->next;while(temp!=NULL){cout<<"L"<<temp->k<<": "<<temp->op<<", "<<temp->op1<<", "<<temp->op2<<","<<temp->result<<""<<endl;temp=temp->next;}cout<<""<<endl;symb *Stemp;Stemp=symb_head->next;cout<<"name"<<" type "<<" id "<<" identifer "<<"addr"<<endl;while(Stemp!=NULL){cout<<Stemp->word<<" int "<<" 25 "<<" sv "<<Stemp->addr<<endl;Stemp=Stemp->next;}}if(err==2)//{cout<<endl;system("pause");cout<<endl;cout<<"************************"<<endl; cout<<"* *"<<endl;cout<<"************************"<<endl; cout<<""<<errword<<"!"<<endl;}}string id_numtoname(int num)//{str *temp;string name;temp=string_head->next;while(temp!=NULL){if(num==temp->num){name=temp->word;break;。