#include<stdio.h>
#include<stdlib.h>
#define MAXSIZE 5
struct stack
{
int stk[MAXSIZE];
int top;
};
typedef struct stack ST;
ST s;
/*Function to add an element to stack */
void push ()
{
int num;
if (s.top == (MAXSIZE - 1))
{
printf ("Stack is Full\n");
return;
}
else
{
printf ("\nEnter element to be pushed : ");
scanf ("%d", &num);
s.top = s.top + 1;
s.stk[s.top] = num;
}
return;
}
/*Function to delete an element from stack */
int pop ()
{
int num;
if (s.top == - 1)
{
printf ("Stack is Empty\n");
return (s.top);
}
else
{
num = s.stk[s.top];
printf ("poped element is = %d\n", s.stk[s.top]);
s.top = s.top - 1;
}
return(num);
}
/*Function to display the status of stack */
void display ()
{
int i;
if (s.top == -1)
{
printf ("Stack is empty\n");
return;
}
else
{
printf ("\nStatus of elements in stack : \n");
for (i = s.top; i >= 0; i--)
{
printf ("%d\n", s.stk[i]);
}
}
}
int main ()
{
int ch;
s.top = -1;
printf ("\tSTACK OPERATIONS\n");
printf("----------------------------\n");
printf(" 1. PUSH\n");
printf(" 2. POP\n");
printf(" 3. DISPLAY\n");
printf(" 4. EXIT\n");
//printf("----------------------------\n");
while(1)
{
printf("\nChoose operation : ");
scanf("%d", &ch);
switch (ch)
{
case 1:
push();
break;
case 2:
pop();
break;
case 3:
display();
break;
case 4:
exit(0);
default:
printf("Invalid operation \n");
}
}
return 0;
}
