//---------------------------------------------------
// Purpose: Demonstrate file input/output
// Author:  John Gauch and Wing Ning Li
//---------------------------------------------------
#include <cstdlib>
#include <fstream>
#include <iostream>
using namespace std;

int main()
{
   // Open outfile.txt to store what the user inputs
   ofstream dout;
   dout.open("outfile.txt");

   // Loop reading from key board or stdin and writing to outfile.txt
   // also perform analysis of each character read
   // some key may have several character associated with it.
   char ch;
   while (cin.get(ch)){
       // Check the integer value of the characer
       cout << "integer value of the character is " << (int)ch << endl;

       // The following is based on ASCII table on page 975 of the text
       if (ch == 9) {
           cout << "tab key\n";
       }
       else if (ch == 10){
           cout << "new line key\n";
       }
       else if (ch == 13){
           cout <<"carriage return key\n";
       }
       else if (ch <= 31){
           cout << "other non printable character\n";
       }
       else if (ch == 32) {
           cout << "space\n";
       }
       else if (ch >= 33 && ch <= 47){
           cout << "special character !\"#$%&'()*+,-./\n";
       }
       else if (ch >= 48 && ch <= 57){
           cout << "digits 0 to 9\n";
       }
       else if (ch >= 58 && ch <= 64){
           cout << "special characters :;<+>?@\n";
       }
       else if (ch >= 65 && ch <= 90){
           cout << "upper case letters\n";
       }
       else if (ch >= 91 && ch <= 96){
           cout << "special characters [\\]^_`\n";
       }
       else if (ch >= 97 && ch <= 122){
           cout << "lower case letters\n";
       }
       else if (ch >= 123 && ch <= 126){
           cout << "special characters\n";
       }
       else if (ch == 127){
           cout << "DEL\n";
       }
       else {
           cout << "not a standard ASCII character, first bit is 1\n";
       }

      // Write the character to the output file
      dout << ch;
   }

   // Close output file
   dout.close();


   // We now try to read from the file we just written
   ifstream din;
   din.open("outfile.txt");

   // Assume open is ok and loop reading characters
   while (din.get(ch)){
       cout << ch;
   }

   // Close input file 
   din.close();
}