SOURCE FILE: ex0805.cpp

//   
// Example 8.5.  This interactive program repeatedly asks    
// the user for a character and prints its ASCII code.   
//    
   
#include <iostream.h>
   
const char YES = 'y';   
const char NO  = 'n';   
    
char GetCharNewline(void);   

int main(void)   
{   
   char GetAnswer(void);  
    
   char in_char,    // input character to encode 
        answer;     // answer to continue? 
      
   cout << "Given a character, this program prints its ASCII code.\n";
   do   
   {   
      cout << "Enter a character: ";
      in_char = GetCharNewline();   
         
      cout << "The ASCII value of " << in_char << " is " 
           << int(in_char) << ".\n";
      answer = GetAnswer();   
   }   
   while (answer == YES);   
   
   return 0;
}   
   
//   
// Function to read and return a character and to move the   
// input buffer pointer past the newline character   
// Pre:  none   
// Post: An input character was returned and the buffer flushed.   
//    
   
char GetCharNewline(void)   
{   
   char in_char;   
      
   cin.get(in_char);   
   if (in_char != '\n')
      cin.ignore(256, '\n');   
   
   return in_char;   
}   
   
//   
// Function to ask if user wishes to continue and to return   
// the user's response after flushing the input buffer   
// Pre:  none   
// Post: A y or an n was returned and the buffer flushed.   
//    
   
char GetAnswer(void)   
{   
   char answer;         // answer for wanting another code 
      
   do   
   {   
      cout << "\nDo you want to find another ASCII code? (y/n) ";
      answer = GetCharNewline();   
   }   
   while ( !(answer == YES || answer == NO) );   
      
   return answer;   
}