mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 22:06:28 +08:00
104 lines
2 KiB
C
104 lines
2 KiB
C
/**
|
||
* File: array_stack.c
|
||
* Created Time: 2023-01-12
|
||
* Author: Zero (glj0@outlook.com)
|
||
*/
|
||
|
||
#include "../utils/common.h"
|
||
|
||
#define MAX_SIZE 5000
|
||
|
||
/* 基于数组实现的栈 */
|
||
struct arrayStack {
|
||
int *data;
|
||
int size;
|
||
};
|
||
|
||
typedef struct arrayStack arrayStack;
|
||
|
||
/* 构造函数 */
|
||
arrayStack *newArrayStack() {
|
||
arrayStack *s = malloc(sizeof(arrayStack));
|
||
// 初始化一个大容量，避免扩容
|
||
s->data = malloc(sizeof(int) * MAX_SIZE);
|
||
s->size = 0;
|
||
return s;
|
||
}
|
||
|
||
/* 获取栈的长度 */
|
||
int size(arrayStack *s) {
|
||
return s->size;
|
||
}
|
||
|
||
/* 判断栈是否为空 */
|
||
bool isEmpty(arrayStack *s) {
|
||
return s->size == 0;
|
||
}
|
||
|
||
/* 入栈 */
|
||
void push(arrayStack *s, int num) {
|
||
if (s->size == MAX_SIZE) {
|
||
printf("stack is full.\n");
|
||
return;
|
||
}
|
||
s->data[s->size] = num;
|
||
s->size++;
|
||
}
|
||
|
||
/* 访问栈顶元素 */
|
||
int peek(arrayStack *s) {
|
||
if (s->size == 0) {
|
||
printf("stack is empty.\n");
|
||
return INT_MAX;
|
||
}
|
||
return s->data[s->size - 1];
|
||
}
|
||
|
||
/* 出栈 */
|
||
int pop(arrayStack *s) {
|
||
if (s->size == 0) {
|
||
printf("stack is empty.\n");
|
||
return INT_MAX;
|
||
}
|
||
int val = peek(s);
|
||
s->size--;
|
||
return val;
|
||
}
|
||
|
||
/* Driver Code */
|
||
int main() {
|
||
/* 初始化栈 */
|
||
arrayStack *stack = newArrayStack();
|
||
|
||
/* 元素入栈 */
|
||
push(stack, 1);
|
||
push(stack, 3);
|
||
push(stack, 2);
|
||
push(stack, 5);
|
||
push(stack, 4);
|
||
printf("栈 stack = ");
|
||
printArray(stack->data, stack->size);
|
||
|
||
/* 访问栈顶元素 */
|
||
int val = peek(stack);
|
||
printf("栈顶元素 top = %d\n", val);
|
||
|
||
/* 元素出栈 */
|
||
val = pop(stack);
|
||
printf("出栈元素 pop = %d，出栈后 stack = ", val);
|
||
printArray(stack->data, stack->size);
|
||
|
||
/* 获取栈的长度 */
|
||
int size = stack->size;
|
||
printf("栈的长度 size = %d\n", size);
|
||
|
||
/* 判断是否为空 */
|
||
bool empty = isEmpty(stack);
|
||
printf("栈是否为空 = %s\n", empty ? "true" : "false");
|
||
|
||
// 释放内存
|
||
free(stack->data);
|
||
free(stack);
|
||
|
||
return 0;
|
||
}
|