#define TRUE 1
#define FALSE 0
#define STACK_SIZE 100

typedef char ElementType;
typedef struct
{
    ElementType data[STACK_SIZE];
    int top;
}SeqStack;

void InitStack(SeqStack *s)
{
    s->top = -1;
}

int IsEmpty(SeqStack *s)
{
    if(s->top == -1)
        return TRUE;
    return FALSE;
}

int IsFull(SeqStack *s)
{
    if(s->top == STACK_SIZE - 1)
        return TRUE;
    return FALSE;
}

int Push(SeqStack *s, ElementType element)
{
    if(IsFull(s))
        return FALSE;
    s->top ++;
    s->data[s->top] = element;
    return TRUE;
}

int Pop(SeqStack *s, ElementType *element)
{
    if(IsEmpty(s))
        return FALSE;
    *element = s->data[s->top];
    s->top --;
    return TRUE;
}

int GetTop(SeqStack *s,ElementType *element)
{
    if(IsEmpty(s))
        return FALSE;
    *element = s->data[s->top];
    return TRUE;
}