#include <fstream.h>
#include <String.h>
#include <Integer.h>
#include "stdio.h"
#include "stdlib.h"
extern "C" char *getenv(const char *name);

main( )
{    cout << "Content-type: text/html" << char(10) << char(10);
     String com = getenv("QUERY_STRING");
     char c;
     int count = 0;
     String my_address = "/Net/mathstat/Users/Fac1/djaffe";

     if ( com.length( ) < 3 || com[0] != 'n' || com[1] != '=' 
          || !com.contains("&k=") ) 
     {    cout << "Illegal request.";
          exit(0);    }

     String html1_addr = my_address + 
          "/Library/Public_html/codes/codeform.html1";
     FILE *html1;
     html1 = fopen( (&(html1_addr[0])), "r" );
     while( (c=getc(html1)) != EOF ) cout << c;
     fclose(html1);

     com.del( "n=" );
     String ns = com.before("&k=");
     String ks = com.after("&k=");
     int n =  int( atoI(ns).as_long( ) ); 
     int k =  int( atoI(ks).as_long( ) ); 
     cout << "Answer when n = " << n << " and k = " << k << ":\n";
     cout << "<blockquote><font color=purple><p>\n";
     String nkfile = my_address + "/Library/Public_html/binary/" + dec(n) + 
          "/" + dec(k) + "/@main";
     FILE *fp;
     FILE *html2;

     if ( n <= 0 ) 
     {    cout << "Your value for n must be at least 1.\n";
          goto tail;    }
     if ( k <= 0 || k >= n )
     {    cout << "Your value for k must be between 1 and n-1.\n";
          goto tail;    }
     fp=fopen((&(nkfile[0])), "r");
     if ( fp == 0 )
     {    cout << "I'm sorry, but I have no information for codes with "
               << "n = " << n << " and k = " << k << ".\n";
          goto tail;    }
     while( (c=getc(fp)) != EOF ) 
     {    cout << c;
          count++;
          if ( c == '\n' || c == ' ' ) count = 0;
          if ( count >= 80 && c == ',' )
          {    count = 0;
               cout << "\n";    }    }
     fclose(fp);

     tail:
     cout << "</font></blockquote><hr>\n";
     String html2_addr = my_address + 
          "/Library/Public_html/codes/codeform.html2";
     html2 = fopen( (&(html2_addr[0])), "r" );
     while( (c=getc(html2)) != EOF ) cout << c;
     fclose(html2);    }