stackarray.c

#include <stdio.h>
#include<conio.h>
#define MAX 5
int top, status;
 
/*PUSH FUNCTION*/
void push (int stack[], int item)
{   if (top == (MAX-1))
	status = 0;
    else
    {   status = 1;
	++top;
	stack [top] = item;
    }
}
 
/*POP FUNCTION*/
int pop (int stack[])
{  
    int ret;
    if (top == -1)
    {   ret = 0;
	status = 0;
    }
    else
    {   status = 1;
	ret = stack [top];
	--top;
    }
return ret;
}
 
/*FUNCTION TO DISPLAY STACK*/
void display (int stack[])
{   int i;
    printf ("\nThe Stack is: ");
    if (top == -1)
	printf ("empty");
    else
    {   for (i=top; i>=0; --i)
	   printf ("\n--------\n|%3d   |\n--------",stack[i]);
    }
    printf ("\n");
}
 
/*MAIN PROGRAM*/
int main()
{  
    int stack [MAX], item;
    int ch;
    clrscr ();
    top = -1;
 
    do
    {  do
       {   printf ("\nAIN MENU");
	   printf ("\n1.PUSH (Insert) in the Stack");
	   printf ("\n2.POP  (Delete) from the Stack");
	   printf ("\n3.Exit (End the Execution)");
	   printf ("\nEnter Your Choice: ");
	   scanf  ("%d", &ch);
	   if (ch<1 || ch>3)
	       printf ("\nInvalid Choice, Please try again");
	}while (ch<1 || ch>3);
       switch (ch)
       {
	case 1:
		printf ("\nEnter the Element to be pushed : ");
		scanf  ("%d", &item);
		printf (" %d", item);
		push (stack, item);
		if (status)
		{   printf ("\nAfter Pushing ");
		    display (stack);
		    if (top == (MAX-1))
			printf ("\nThe Stack is Full");
		}
		else
		    printf ("\nStack overflow on Push");
		break;
       case 2:
		item = pop (stack);
		if (status)
		{    printf ("\nThe Popped item is %d.  After Popping: ",item);
		     display (stack);
		}
		else
		     printf ("\nStack underflow on Pop");
		break;
       default:
		printf ("\nEND OF EXECUTION");
       }
    }while (ch != 3);
getch();
return 0;
}