how to stop the loop

[amits]

i have done this porgram that sorts alphabets in ascending or descending order,
when compiling this program, i only get one error saying

fatal error c1004 : unexpected end of file found.

here is the code:

#include <iostream>
#include <cctype>
#include <cstdlib>

int main()
{
	char	strspace[50];	/* enough ?? */
	printf("Enter a string ");
	scanf("%s",strspace);
	printf("The string was >>%s<<\n",strspace);

using namespace std;

{  char ans;
   do
   {
      //Declarations
        char string[21];
        char decrypt;
        int i;

      //Get string from user
        cout<<"Enter a string no longer than 20 characters long:"<<endl;
        cin.get(string,20);
        cin.ignore(80,'\n');
        cout<<endl;

      //encrypt 
        for(int a = 0; a < strlen(string); a++)
        {
           if(isupper (string[a]))
              i = (int) 'A';
           else if(islower ((int) string[a]))
              i = (int) 'a';

           if(isalpha(string[a]))
           {
              string[a] = string[a] - i;
              string[a] = string[a] + 1;
              string[a] = string[a] % 26;
              string[a] = string[a] + i;
           }
        }

      

      //Ask for decrypt
        cout<<"Would you like to decrypt this string? (y,n) ";
        cin>>decrypt;
        cout<<endl;

      //Decrypt and output
        if(decrypt != 'n') //decrypt?
        {
           for(int j = 0; j < strlen(string); j++) //decrypt individual characters
           {
              if(isalpha(string[j]))
              {
                 if(isupper (string[j]))
                    i = (int) 'A';
                 else if(islower ((int) string[j]))
                    i = (int) 'a';

                 string[j] = string[j] - i;
                 string[j] = string[j] - 1;
                 if(string[j] < 0)
                 string[j] = 25;
                 string[j] = string[j] + i;
              }
           }
           cout<<endl<<endl<<"The decrypted string is: "<<string<<endl<<endl;
        }

      //Run again code
        cout<< "Would you like to run this program again? (y,n) ";
        cin>>ans;
        cin.sync();

   }while(ans != 'n');
   return 0;}
}

can anyone investigate what the error is?

thanks