stack.cpp

class Stack{
      public:
      Stack(){
                    stack^stack;
                    position=1;
                    }
                    
      void push(bool input){
           if(position>32)
                          puts("Stack overflow");
      
           else{
                stack <<= 1;
                stack |= input;
                position<<=1;
                }
           }
      
      bool pop(){
           if(!(position>>1))
                        puts("Stack underflow");
                        
           else{      
               position>>=1;  
               bool pop=stack&position;
               stack&(~position);
               return pop;
               }
           }

      private:
      unsigned stack : 32;
      unsigned position : 32;
      };