//SEPTEMBER 10, 2002

 

 

#include <iostream.h>

void push(int mystack[], int&mytop, int item){

       mystack[mytop]=item;

         mytop=mytop+1; }   //PUSH

int pop(int mystack[], int&mytop){

       mytop=mytop-1;

         int item=mystack[mytop];

         return item;}     //POP

int isempty(int mytop){

       if(mytop==0) return 1;

         else return 0;}      //ISEMPTY

 

int isfull(int mytop, const int maxstacksize){

       if(mytop==maxstacksize) return 1;

         else return 0;}      //ISFULL

           

void main(){

     const int maxstacksize=5;

       int mystack[maxstacksize]; int mytop,x,option;

       mytop=0;               //STACK TOP INITILIZATION

       

       do{ cout<<"select one of the following options: "<<endl;

           cout<<"1-push 2-pop 3-isempty 4-isfull 5-quit:  ";

             cin>>option;

             switch(option){

                case 1: if(isfull(mytop,maxstacksize))

                          cout<<"you can't push" <<endl;

                        else{ cout<<"enter the number that will be pushed: ";

                              cin >>x;

                                push(mystack,mytop,x);}    //ELSE

                                break;

                  case 2: if(isempty(mytop))

                          cout<<"you can't pop" <<endl;

                              else { cout<<"the number popped is: "<<pop(mystack,mytop);

                                       cout <<endl;}      //ELSE

                                       break;

                  case 3: if(isempty(mytop)==1)

                          cout<<"stack empty. " <<endl;

                              else cout<<"stack is not empty." <<endl;

                              break;

                  case 4: if(isfull(mytop,maxstacksize)==1)

                          cout<<"stack full." <<endl;

                              else cout<<"stack is not full." <<endl;

                              break;

                             

                  case 5: cout<<"thank you for using our menu!"<<endl;

                              break;

                              default:cout<<"enter correct options"<<endl;  }  //SWITCH  

                              } while (option!=5);

                             

                              }            //MAIN