C检查数组堆栈是否为空

#include <stdio.h>

#define MAX_SIZE 100

int stack[MAX_SIZE];
int top = -1;

void push(int value) {
    if (top >= MAX_SIZE - 1) {
        printf("Stack Overflow\n");
        return;
    }
    stack[++top] = value;
}

int pop() {
    if (top < 0) {
        printf("Stack Underflow\n");
        return -1;
    }
    return stack[top--];
}

int isEmpty() {
    return (top == -1);
}

int main() {
    push(10);
    push(20);
    push(30);

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

    pop();
    pop();
    pop();

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

    return 0;
}