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Displaying  Source Code(s)  
 

 
Program to Convert CNF -> PDA.

--------------------------------------------------------------------------------



#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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