implement stack using link list in c
#include <stdio.h>
#include <stdlib.h>
#define TRUE 1
#define FALSE 0
struct node
{
int data;
struct node *next;
};
typedef struct node node;
node *top;
void initialize()
{
top = NULL;
}
void push(int value)
{
node *tmp;
tmp = malloc(sizeof(node));
tmp -> data = value;
tmp -> next = top;
top = tmp;
}
int pop()
{
node *tmp;
int n;
tmp = top;
n = tmp->data;
top = top->next;
free(tmp);
return n;
}
int Top()
{
return top->data;
}
int isempty()
{
return top==NULL;
}
void display(node *head)
{
if(head == NULL)
{
printf("NULL\n");
}
else
{
printf("%d\n", head -> data);
display(head->next);
}
}
int main()
{
initialize();
push(10);
push(20);
push(30);
printf("The top is %d\n",Top());
pop();
printf("The top after pop is %d\n",Top());
display(top);
return 0;
}