数据结构 栈 C语言 简单实现

#define MAXSIZE 100

typedef struct {
    int top;
    int data[MAXSIZE]
} Stack;

void push(Stack* st, int data) {
    if (st->top == MAXSIZE)
        return;

    st->data[st->top++] = data;
}

int pop(Stack* st) {
    if (st->top == 0)
        return -1;

    return st->data[--st->top];
}