A program to calculate the First & Follow of a grammar.
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Joined: Sep 2010
#1
22-01-2011, 01:27 PM





Code:
#include"stdio.h"
#include<conio.h>
#define max 10
#define MAX 15
char array[max][MAX],temp[max][MAX];
int c,n,t;void fun(int,int[]);
int fun2(int i,int j,int p[],int key)
{
int k;
if(!key)
{
for(k=0;k<n;k++)
if(array[i][j]==array[k][0])
break;
p[0]=i;p[1]=j+1;
fun(k,p);
return 0;
}
else
{
for(k=0;k<=c;k++)
{
if(array[i][j]==temp[t][k])
break;
}
if(k>c)return 1;
else return 0;
}
}
void fun(int i,int p[])
{
int j,k,key;
for(j=2;array[i][j]!='\0';j++)
{
if(array[i][j-1]=='/')
{
if(array[i][j]>='A'&&array[i][j]<='Z')
{
key=0;
fun2(i,j,p,key);
}
else
{key=1;
if(fun2(i,j,p,key))
temp[t][++c]=array[i][j];
if(array[i][j]=='@'&&p[0]!=-1)
{ //taking ,@, as null symbol.
if(array[p[0]][p[1]]>='A'&&array[p[0]][p[1]]<='Z')
{
key=0;
fun2(p[0],p[1],p,key);
}
else
if(array[p[0]][p[1]]!='/'&&array[p[0]][p[1]]!='\0')
{
if(fun2(p[0],p[1],p,key))
temp[t][++c]=array[p[0]][p[1]];
}
}
}
}
}
}
char fol[max][MAX],ff[max];int f,l,ff0;
void ffun(int,int);
void follow(int i)
{
int j,k;
for(j=0;j<=ff0;j++)
if(array[i][0]==ff[j])
return 0;
if(j>ff0)ff[++ff0]=array[i][0];
if(i==0)fol[l][++f]='$';
for(j=0;j<n;j++)
for(k=2;array[j][k]!='\0';k++)
if(array[j][k]==array[i][0])
ffun(j,k);
}
void ffun(int j,int k)
{
int ii,null=0,tt,cc;
if(array[j][k+1]=='/'||array[j][k+1]=='\0')
null=1;
for(ii=k+1;array[j][ii]!='/'&&array[j][ii]!='\0';ii++)
{
if(array[j][ii]<='Z'&&array[j][ii]>='A')
{
for(tt=0;tt<n;tt++)
if(temp[tt][0]==array[j][ii])break;
for(cc=1;temp[tt][cc]!='\0';cc++)
{
if(temp[tt][cc]=='@')null=1;
else fol[l][++f]=temp[tt][cc];
}
}
else fol[l][++f]=array[j][ii];
}
if(null)follow(j);
}
void main()
{
int p[2],i,j;
clrscr();
printf("Enter the no. of productions :");
scanf("%d",&n);
printf("Enter the productions :\n");
for(i=0;i<n;i++)
scanf("%s",array[i]);
for(i=0,t=0;i<n;i++,t++)
{
c=0,p[0]=-1,p[1]=-1;
temp[t][0]=array[i][0];
fun(i,p);
temp[t][++c]='\0';
printf("First(%c) : [ ",temp[t][0]);
for(j=1;j<c;j++)
printf("%c,",temp[t][j]);
printf("\b ].\n");
getch();
}
/* Follow Finding */
for(i=0,l=0;i<n;i++,l++)
{
f=-1;ff0=-1;
fol[l][++f]=array[i][0];
follow(i);
fol[l][++f]='\0';
}
for(i=0;i<n;i++)
{
printf("\nFollow[%c] : [ ",fol[i][0]);
for(j=1;fol[i][j]!='\0';j++)
printf("%c,",fol[i][j]);
printf("\b ]");
getch();
}
}



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