I need someone to debug the lines of c++ code I wrote below so it can run. It is intended to spell check the word "and" using state to state transition.

include

include

using namespace std;

string in_str; int n; void spell_check() { int i; FILE *in_file;

 while (!EOF(in_file))
 {
       fscanf(in_str);
       n = strlen(in_str);
       start(in_str,n);
 }

}

void start() { char next_char;

 int i = 0;
 if (n == 0)
 {
       cout<<"This is an empty string";
       exit();//do something here to terminate the program
 }
 else{
      next_char = in_str[i];

      if(next_char == 'a')
      {
                   i++;
                   if(i >= n) error();
                   else state_A(i);
      }
      else error();
 }

}

void state_A(int i) { if(in_str[i] == 'n') { i++; if(i

void state_AN(int i) { if(in_str[i] == 'd') { if(i == n-1) cout<<" Your keyword spelling is correct"; else cout<<"Wrong keyword spelling"; } }

int main() { spell_check(); return 0; }