FOLLOW OF A GIVEN GRAMMER USING C
#include<stdio.h>
#include<string.h>
int n,m=0,p,i=0,j=0;
char a[10][10],followResult[10];
void follow(char c);
void first(char c);
void addToResult(char);
int main()
{
int i;
int choice;
char c,ch;
printf("Enter the no.of productions: ");
scanf("%d", &n);
printf(" Enter %d productions\nProduction with multiple terms should be give as separate productions \n", n);
for(i=0;i<n;i++)
scanf("%s%c",a[i],&ch);
// gets(a[i]);
do
{
m=0;
printf("Find FOLLOW of -->");
scanf(" %c",&c);
follow(c);
printf("FOLLOW(%c) = { ",c);
for(i=0;i<m;i++)
printf("%c ",followResult[i]);
printf(" }\n");
printf("Do you want to continue(Press 1 to continue....)?");
scanf("%d%c",&choice,&ch);
}
while(choice==1);
}
void follow(char c)
{
if(a[0][0]==c)addToResult('$');
for(i=0;i<n;i++)
{
for(j=2;j<strlen(a[i]);j++)
{
if(a[i][j]==c)
{
if(a[i][j+1]!='\0')first(a[i][j+1]);
if(a[i][j+1]=='\0'&&c!=a[i][0])
follow(a[i][0]);
}
}
}
}
void first(char c)
{
int k;
if(!(isupper(c)))
//f[m++]=c;
addToResult(c);
for(k=0;k<n;k++)
{
if(a[k][0]==c)
{
if(a[k][2]=='$') follow(a[i][0]);
else if(islower(a[k][2]))
//f[m++]=a[k][2];
addToResult(a[k][2]);
else first(a[k][2]);
}
}
}
void addToResult(char c)
{
int i;
for( i=0;i<=m;i++)
if(followResult[i]==c)
return;
followResult[m++]=c;
}
RESULT
:
#include<stdio.h>
#include<string.h>
int n,m=0,p,i=0,j=0;
char a[10][10],followResult[10];
void follow(char c);
void first(char c);
void addToResult(char);
int main()
{
int i;
int choice;
char c,ch;
printf("Enter the no.of productions: ");
scanf("%d", &n);
printf(" Enter %d productions\nProduction with multiple terms should be give as separate productions \n", n);
for(i=0;i<n;i++)
scanf("%s%c",a[i],&ch);
// gets(a[i]);
do
{
m=0;
printf("Find FOLLOW of -->");
scanf(" %c",&c);
follow(c);
printf("FOLLOW(%c) = { ",c);
for(i=0;i<m;i++)
printf("%c ",followResult[i]);
printf(" }\n");
printf("Do you want to continue(Press 1 to continue....)?");
scanf("%d%c",&choice,&ch);
}
while(choice==1);
}
void follow(char c)
{
if(a[0][0]==c)addToResult('$');
for(i=0;i<n;i++)
{
for(j=2;j<strlen(a[i]);j++)
{
if(a[i][j]==c)
{
if(a[i][j+1]!='\0')first(a[i][j+1]);
if(a[i][j+1]=='\0'&&c!=a[i][0])
follow(a[i][0]);
}
}
}
}
void first(char c)
{
int k;
if(!(isupper(c)))
//f[m++]=c;
addToResult(c);
for(k=0;k<n;k++)
{
if(a[k][0]==c)
{
if(a[k][2]=='$') follow(a[i][0]);
else if(islower(a[k][2]))
//f[m++]=a[k][2];
addToResult(a[k][2]);
else first(a[k][2]);
}
}
}
void addToResult(char c)
{
int i;
for( i=0;i<=m;i++)
if(followResult[i]==c)
return;
followResult[m++]=c;
}
RESULT
:
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