stack.c

自己做的常用库和实现的数据结构。public domain.

/* Demo of using simplest stack data sturcture, coverting numbers from Dec to Oct.
 *
 * Written by Cyril Hu ([e-mail]), public domain.
 */

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

struct a {
	int x;
	struct a *next;
} *top;

int stack_empty(struct a *p)
{
	return p ? 0 : 1;
}

struct a *push(int i)
{
	struct a *p;
	static int cnt=0;
	p = malloc(sizeof(struct a));
	p->x = i;
	if(cnt++ == 0) 
		p->next = NULL;
	p->next = top;
	top = p;
	return top;
}

struct a *pop(struct a *p)
{
	struct a *t;
	t = p->next;
	free(p);
	return t;
}

int main(void)
{
	int n;
	puts("Input a integer number");
	scanf("%d", &n);
	while(n) {
		top = push(n%8);
		n /= 8;
	}
	while(!stack_empty(top)) {
		printf("%d", top->x);
		top = pop(top);
	}
	puts("");

	return EXIT_SUCCESS;
}