利用进栈，出栈操作实现十进制数转换为K进制数

求各位大神看看这程序哪错了，执行结果很离谱，让人很无语
利用进栈，出栈操作实现十进制数转换为K进制数
#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
#define STACK_INIT_SIZE 100
#define STACKINCREMENT 10
typedef struct
{
    char *base;
    char *top;
    int stacksize;
}Sqstack;
int StackInit(Sqstack *s)
{
    s->base=(char *)malloc(STACK_INIT_SIZE *sizeof(int));
    if(!s->base)
        return 0;
    s->top=s->base;
    s->stacksize=STACK_INIT_SIZE;
    return 1;
}
int Push(Sqstack *s,char e)
{
    if(s->top-s->base>=s->stacksize)
    {
        s->base=(char *)realloc(s->base,(s->stacksize+STACKINCREMENT)*sizeof(int));
        if(!s->base)
            return 0;
    s->top=s->base+s->stacksize;
    s->stacksize+=STACKINCREMENT;
    }
    *s->top++=e;
    return e;
}
int Pop(Sqstack *s,char e)
{
    if(s->top==s->base)
        return 0;
    e=--*s->top;
    return e;
}
int stackempty(Sqstack *s)
{
    if(s->top==s->base)
       return 1;
    else
        return 0;
}
int tf(Sqstack *s)
{
    int n,i=0,k,m;
    char a,e;
    printf("输入要转化的十进制数：\n");
    scanf("%d",&n);
    printf("输入要转化为的进制:\n");
    scanf("%d",&k);
    printf("将十进制数%d转化为%d进制是：\n",n,k);
    while(n)
    {
        m=n%k;
        if(m<10)
            a=48+m;
        else
            a=65+m-10;
        Push(s,a);
        n=n/k;
    }
    while(!stackempty(s))
    {
        Pop(s,e);
        printf("%c",e);
    }
    printf("\n");
    return 0;
}
int main()
{
    Sqstack s;
    StackInit(&s);
    tf(&s);
    return 0;
}