In this program i have converted a DFA into c++ / C Plus Plus program that checks weather a string contains "nano" or not. Program is written below

#include 
#include 
using namespace std;
int main()
{
 int state = 0;
 char c;
 cout << "Press \'.\' to terminate program." << endl;
 while(c != '.')
 {
  c = getche();

  switch(state)
  {
   case 0:
   {
    if(c=='n')
     state=1;
    else
     state=0;
    break;
   }

   case 1:
   {
       if(c=='a')
     state=2;
    else if(c=='n')
     state=1;
    break;
   }
   case 2:
   {
       if(c=='n')
     state=3;
    else if(c=='a')
     state=0;
    break;
   }
   case 3:
   {
    if(c=='o')
     state=4;
    else if(c=='n')
     state=1;
    else
     state=0;
    break;
   }
   case 4:
   {
    break;
   }
  }
 }
 if(state == 4)
      cout << endl << "nano is exits in this string." << endl;

 getch();
}