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#define SIZE 10            /* Size of Stack */
int s[SIZE],top[3]={0,-1,SIZE};
       /* Global declarations */
push(int elem,int stno)
 {
  int pos;      /* Function for PUSH operation */
  if( Sfull()) printf("nn Overflow!!!!nn");
  else
   {
    if(stno==1) pos= ++top[stno];
     else pos=--top[stno];
    s[pos]=elem;
    }
  }


int pop(int stno)
 {                      /* Function for POP operation */
  int elem,pos;
  if(Sempty(stno)){ printf("nnUnderflow!!!!nn");
  return(-1); }
  else
   {
    pos=top[stno];
    elem=s[pos];
    if(stno == 1)top[stno]--;
    else
    top[stno]++;
    return(elem);
   }
 }

 int Sfull()
  {                     /* Function to Check Stack Full */
    if(top[1] == top[2]-1) return 1;
    return 0;
  }

 int Sempty(stno)
  {
      /* Function to Check Stack Empty */
    switch(stno)
    {
    case 1: if(top[1] == -1) return 1; else return 0;
    case 2: if(top[2] == SIZE) return 1;else return 0;
    }
  }

  display(int stno)
   {                  /* Function to display status of Stack */
    int i;
    if(Sempty(stno)) printf(" n Empty Stackn");
    else
     {
     if(stno == 1)
     {
      for(i=0;i<=top[stno];i++)
 printf("%dn",s[i]);
      printf("^Top");
     }
     else
     {
     for(i=SIZE-1;i>=top[stno];i--)
 printf("%dn",s[i]);
      printf("^Top");
     }
   }
   }

  main()
  {                         /* Main Program */
   int opn,elem,stno;
   do
    {
     clrscr();
     printf("n ### Stack Operations ### nn");
     printf("n Stack Number (1,2): ");
     scanf("%d",&stno);
     printf("n Press 1-Push, 2-Pop,3-Display,4-Exitn");
     printf("n Your option ? ");
     scanf("%d",&opn);

     switch(opn)
      {
       case 1: printf("nnRead the element to be pushed ?");
        scanf("%d",&elem);
        push(elem,stno); break;
       case 2: elem=pop(stno);
        if( elem != -1)
    printf("nnPopped Element is %d n",elem);
        break;
       case 3: printf("nnStatus of Stack %d nn",stno);
        display(stno); break;
       case 4: printf("nn Terminating nn"); break;
       default: printf("nnInvalid Option !!! Try Again !! nn");
  break;
      }
      printf("nnnn  Press a Key to Continue . . . ");
      getch();
      }while(opn != 4);
   }

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