Samples/IntStack/intStack.cpp at master · r2d2Proton/Samples · GitHub

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/*--------------------------------------------------------------------------+
|     Name:  Jerome Richards                                                |
|   Course:  CNS-2400 F01                                                   |
|                                                                           |
|  Program:  Integer Stack                                                  |
|     File:  intStack.cpp                                                   |
|                                                                           |
|  Class implementation for Integer_stack                                   |
+--------------------------------------------------------------------------*/
#include "intStack.h"


Integer_stack::Integer_stack()
{
   top_a = 0;
   top_b = THETOP;
}


Integer_stack::stackCode Integer_stack::pusha( int theInt )
{
   stackCode theCode = isOVERFLOW;

   if( top_a <= top_b )
   {
      itsStack[ top_a ] = theInt;

      top_a++;
      theCode = isSUCCESS;
   }

   return theCode;
}


Integer_stack::stackCode Integer_stack::popa()
{
   stackCode theCode = isUNDERFLOW;

   if( top_a > 0 )
   {
      top_a--;
      theCode = isSUCCESS;
   }

   return theCode;
}


Integer_stack::stackCode Integer_stack::topa( int& theInt )
{
   stackCode theCode = isUNDERFLOW;

   if( top_a > 0 )
   {
      theInt = itsStack[ top_a - 1 ];
      theCode = isSUCCESS;
   }

   return theCode;
}


Integer_stack::stackCode Integer_stack::pushb( int theInt )
{
   stackCode theCode = isOVERFLOW;

   if( top_b >= top_a )
   {
      itsStack[ top_b ] = theInt;

      top_b--;
      theCode = isSUCCESS;
   }

   return theCode;
}


Integer_stack::stackCode Integer_stack::popb()
{
   stackCode theCode = isUNDERFLOW;

   if( top_b < THETOP )
   {
      top_b++;
      theCode = isSUCCESS;
   }

   return theCode;
}


Integer_stack::stackCode Integer_stack::topb( int& theInt )
{
   stackCode theCode = isUNDERFLOW;

   if( top_b < THETOP )
   {
      theInt = itsStack[ top_b + 1 ];
      theCode = isSUCCESS;
   }

   return theCode;
}


string Integer_stack::getErrStr( stackCode theErr )
{
   string tmpStr;

   switch( theErr )
   {
      case isSUCCESS:

         tmpStr = "success";
         break;

      case isUNDERFLOW:

         tmpStr = "underflow";
         break;

      case isOVERFLOW:

         tmpStr = "overflow";
         break;

      default:

         tmpStr = "unknown";
         break;
   }

   return tmpStr;
}