data_structure/Stack/LinkStack.c

#include <stdio.h>
#include <stdlib.h>

typedef struct LinkStack
{
    char data;
    struct LinkStack *next;
} LinkStack;

LinkStack *push(LinkStack *top, char a)
{
    LinkStack *line = (LinkStack *)malloc(sizeof(LinkStack));
    line->data = a;
    line->next = top;
    top = line;
    return top;
}

LinkStack *pop(LinkStack *top)
{
    if (top)
    {
        LinkStack *p = top;
        top = top->next;
        printf("current = %c \n", p->data);
        if (top)
        {
            printf("top = %c\n", top->data);
        }
        else
        {
            printf("empty\n");
        }
        free(p);
    }
    else
    {
        printf("Stack Empty\n");
        return top;
    }
    return top;
}