C Program to implement NFA from Regular Expression

#include<stdio.h>
#include<conio.h>
int fa[10][10][10],states[2][10],
curr,row=0,col=0,sr=0,sc=0,th=0,in;
char *str;
int nfa(char *string,int state)
{
int i,j;
for(i=0;i<=row;i++)
{
if(*string)
{
curr=fa[state][*string-97][i];
if (curr==-1)
break;
if(nfa(string+1,curr))
return 1;
}
else
{
if(states[1][i]==-1)
break;
if(state==states[1][i])
return 1;
}
}
return 0;
}
int main()
{
FILE *fp;
int i,j,k,flag=0;
char c,ch;
clrscr();
fp=fopen("Nfa_ip.txt","r");
for(i=0;i<2;i++)
for(j=0;j<10;j++)
states[i][j]=-1;
for(i=0;i<10;i++)
for(j=0;j<10;j++)
for(k=0;k<10;k++)
fa[i][j][k]=-1;
while(fscanf(fp,"%d",&in)!=EOF)
{
fscanf(fp,"%c",&c);
if(flag)
{
states[sr][sc++]=in;
if(c=='\n')
{
sr++;
sc=0;
}
}
else if(c=='#')
{
flag=1;
fa[row][col][th]=in;
printf("\nfa[%d][%d][%d]=%d",row,col,th,fa[row][col][the]);
}
else if(!flag)
{
fa[row][col][th]=in;
printf("\nfa[%d][%d][%d]=%d",row,col,th,fa[row][col][th]);
if(c==',')
{
th++;
}
else if(c=='\n')
{
col=0;
row++;
th=0;
}
else if(c!=',')
{
col++;
th=0;
}
}
}
printf("\n\nEnter the string : \n");
scanf("%s",str);
if(nfa(str,states[0][0]))
printf("\nString Is Accepted");
else
printf("\nString Not Accepted");
getch();
return 0;
}