Program for PDA to CFA conversion



Program for PDA to CFA conversion

#include<iostream.h>
#include<dos.h>
#include<stdio.h>
#include<stdio.h>
#include<conio.h>

struct pdastate
   {
   int type;
   char sym;
   int trno;
   int trans[20];
   char tsym[20];
   };

class  pda
   {
   public:
      int n;
      pdastate s[30];

   pda(void)
      {
      n=0;
      }
   void show(void);
   };

void pda::show(void)
   {
   pdastate p;
   clrscr();
   for(int i=0;i<n;i++)
      {
      p=s[i];
      cout<<"
 " State No " := "<<i;
      cout<<"
 " Tag "";
      if(p.type==0)
         cout<<"
 " Start State "";
      else
         if(p.type==1)
            cout<<"
 " Push "<<p.sym<<""";
      else
         if(p.type==2)
            cout<<"
 " Pop State "";
      else
         if(p.type==3)
            cout<<"
 " Read State "";
      else
         if(p.type==4)
            cout<<"
 " Stop State "";
      for(int j=0;j<p.trno;j++)
         {
      cout<<"
 " Transition To State "<<p.trans[j]<<""";
         if(p.tsym[j]!=0)
      cout<<"
 " On Symbol "<<p.tsym[j]<<"""<<endl;
         else
            cout<<endl;
         }
      getch();
      if(i==5)
      clrscr();
      }
   }

union pr
   {
   char a;
   char b[2];
   };

struct prod
   {
   int type;
   union pr p;
   };

class cnf
   {
   private:
         char v[10];
         int vno;
         char t[10];
         int tno;
         struct prod p[30];
         int n;
         int vpr[10];
     public:
         cnf(void);
         pda mkpda(void);
   };

cnf:: cnf(void)
   {
   clrscr();
   char *mess[]={"-","=","["," ","C","F","A"," ","T","O"," ",
   "P","D","A"," ","]","=","-",};
   int xx=31,xxx=48,i,j;
   _setcursortype(_NOCURSOR);
   for(i=0,j=17;i<10,j>=8;i++,j--)
      {
      gotoxy(xx,1);
      cout<<mess[i];
      xx++;
      gotoxy(xxx,1);
      cout<<mess[j];
      xxx--;
      delay(50);
      }
   xx=30;xxx=49;
   _setcursortype(_NORMALCURSOR);
     cout<<"

 " Enter No Of Non Terminal Symbols ":= ";
     cin>>vno;
   for(i=0;i<vno;i++)
      {
      cout<<"
 " Enter A Non-Terminal Symbol ":=";
      cin>>v[i];
      }
   cout<<"
 " Enter The No Of Terminal Symbols ":=";
   cin>>tno;
   for(i=0;i<tno;i++)
      {
      cout<<"
 " Enter A Terminal Symbol ":=";
      cin>>t[i];
      }
   cout<<"
 " Enter The No Of Productions ":=";
   cin>>n;
   int count=0;
   for(i=0;i<vno;i++)
      {
cout<<"
 " Enter No Of Productions Corrosponding To The Non-Terminal "
      <<v[i]<<" ":= ";
       cin>>vpr[i];
       for(int j=0;j<vpr[i];j++)
             {
cout<<"
 " Enter The Type Of Production <1> A-->b , <2> a-->BC ":=";
             cin>>p[count].type;
               if(p[count].type==1)
                  {
                  cout<<"
  "<<v[i]<<" --> ";
                  cin>>p[count].p.a;
                  }
               else
                  {
                  cout<<"
  "<<v[i] <<" --> ";
                  cin>>p[count].p.b[0];
                  cin>>p[count].p.b[1];
                  }
               count++;
             }
      }
   }

pda cnf:: mkpda(void)
   {
     pda p1;
     p1.s[p1.n].type=0;
     p1.s[p1.n].trno=1;
     p1.s[p1.n].trans[0]=1;
     p1.s[p1.n].tsym[0]=0;
     p1.n++;
     p1.s[p1.n].type=1;
     p1.s[p1.n].sym=v[0];
     p1.s[p1.n].trno=1;
     p1.s[p1.n].trans[0]=2;
     p1.s[p1.n].tsym[0]=0;
     p1.n++;
     p1.s[p1.n].type=2;
     p1.s[p1.n].trno=1;
     p1.s[p1.n].trans[0]=3;
     p1.s[p1.n].tsym[0]=238;
     p1.n++;
     p1.s[p1.n].type=3;
     p1.s[p1.n].trno=1;
     p1.s[p1.n].trans[0]=4;
     p1.s[p1.n].tsym[0]=238;
     p1.n++;
     p1.s[p1.n].type=4;
     p1.s[p1.n].trno=0;
     p1.n++;
   int cnt=p1.s[2].trno;
   int c1=0;
   prod temp;
   for(int i=0;i<vno;i++)
      {
      for(int j=0;j<vpr[i];j++)
         {
         temp=p[c1++];
         if(temp.type==1)
            {
            p1.s[2].trans[cnt]=p1.n;
            p1.s[2].tsym[cnt]=v[i];
            p1.s[p1.n].type=3;
            p1.s[p1.n].trno=1;
            p1.s[p1.n].trans[0]=2;
            p1.s[p1.n].tsym[0]=temp.p.a;
            p1.n++;
            cnt++;
            }
         else
            {
            p1.s[2].trans[cnt]=p1.n;
            p1.s[2].tsym[cnt]=v[i];
            p1.s[p1.n].type=1;
            p1.s[p1.n].sym=temp.p.b[1];
            p1.s[p1.n].trno=1;
            p1.s[p1.n].trans[0]=(p1.n)+1;
            p1.s[p1.n].tsym[0]=0;
            p1.n++;
            cnt++;
            p1.s[p1.n].type=1;
            p1.s[p1.n].sym=temp.p.b[0];
            p1.s[p1.n].trno=1;
            p1.s[p1.n].trans[0]=2;
            p1.s[p1.n].tsym[0]=0;
            p1.n++;
            }
         }
      p1.s[2].trno=cnt;
      }
   return(p1);
   }

void main()
   {
   cnf c;
   pda p1;
   p1=c.mkpda();
   getch();
   p1.show();
     getch();
   }
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Program for PDA to CFA conversion

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