用C语言创建pop()函数栈实现

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

#define MAX_SIZE 100

// 定义栈结构
typedef struct {
    int data[MAX_SIZE];
    int top;
} Stack;

// 初始化栈
void initStack(Stack *s) {
    s->top = -1;
}

// 判断栈是否为空
int isEmpty(Stack *s) {
    return s->top == -1;
}

// 判断栈是否已满
int isFull(Stack *s) {
    return s->top == MAX_SIZE - 1;
}

// 入栈操作
void push(Stack *s, int value) {
    if (isFull(s)) {
        printf("Stack is full. Cannot push element.\n");
        return;
    }
    s->data[++s->top] = value;
}

// 出栈操作
int pop(Stack *s) {
    if (isEmpty(s)) {
        printf("Stack is empty. Cannot pop element.\n");
        return -1;
    }
    return s->data[s->top--];
}

// 获取栈顶元素
int top(Stack *s) {
    if (isEmpty(s)) {
        printf("Stack is empty. No top element.\n");
        return -1;
    }
    return s->data[s->top];
}

int main() {
    Stack stack;
    initStack(&stack);

    push(&stack, 1);
    push(&stack, 2);
    push(&stack, 3);

    printf("Top element: %d\n", top(&stack));

    printf("Popped element: %d\n", pop(&stack));
    printf("Popped element: %d\n", pop(&stack));
    printf("Popped element: %d\n", pop(&stack));

    printf("Is stack empty? %s\n", isEmpty(&stack) ? "Yes" : "No");

    return 0;
}