SqStack.h

#ifndef _SQSTACK_H
#define _SQSTACK_H

typedef int dataType;
typedef struct
{
    dataType *data;
    int capacity;
    int stackTop;
} SqStack, *pSqStack;

pSqStack StackCreate(int capacity);
dataType StackPop(pSqStack stack);
int StackPush(pSqStack stack, dataType val);
int StackEmpty(pSqStack stack);
int StackFull(pSqStack stack);
dataType StackTop(pSqStack stack);
int StackClear(pSqStack stack);
int StackFree(pSqStack stack);
int StackShow(pSqStack stack);

#endif

SqStack.c

#include "SqStack.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

pSqStack StackCreate(int capacity)
{
    pSqStack s = (pSqStack)malloc(sizeof(SqStack));
    if (s == NULL)
    {
        printf("StackCreate:pSqStack space allocation failed\n");
        return NULL;
    }

    s->data = (dataType *)malloc(capacity * sizeof(dataType));
    if (s->data == NULL)
    {
        printf("StackCreate:s->data space allocation failed\n");
        free(s);
        s = NULL;
        return NULL;
    }

    memset(s->data, 0, sizeof(dataType) * capacity);
    s->capacity = capacity;
    s->stackTop = -1;
    return s;
}

dataType StackPop(pSqStack stack)
{
    if (stack == NULL)
    {
        printf("StackPop:invalid parameter.\n");
        return -1;
    }

    stack->stackTop--;
    return stack->data[stack->stackTop + 1];
}

int StackPush(pSqStack stack, dataType val)
{
    if (stack == NULL)
    {
        printf("StackPush:invalid parameter.\n");
        return -1;
    }

    if (stack->stackTop == stack->capacity - 1)
    {
        printf("The stack is full.\n");
        return -1;
    }

    stack->stackTop++;
    stack->data[stack->stackTop] = val;

    return 0;
}

int StackEmpty(pSqStack stack)
{
    if (stack == NULL)
    {
        printf("StackEmpty:invalid parameter.\n");
        return -1;
    }
    return (stack->stackTop == -1 ? 1 : 0);
}

int StackFull(pSqStack stack)
{
    if (stack == NULL)
    {
        printf("StackFull:invalid parameter.\n");
        return -1;
    }
    return (stack->stackTop == stack->capacity - 1 ? 1 : 0);
}

dataType StackTop(pSqStack stack)
{
    if (stack == NULL)
    {
        printf("StackTop:invalid parameter.\n");
        return -1;
    }

    return stack->data[stack->stackTop];
}

int StackClear(pSqStack stack)
{
    if (stack == NULL)
    {
        printf("StackClear:invalid parameter.\n");
        return -1;
    }

    stack->stackTop = -1;
    return 0;
}

int StackFree(pSqStack stack)
{
    if (stack == NULL)
    {
        printf("StackFree:invalid parameter.\n");
        return -1;
    }

    if (stack->data != NULL)
    {
        free(stack->data);
    }
    free(stack);
    return 0;
}

int StackShow(pSqStack stack)
{
    if (stack == NULL)
    {
        printf("StackShow:invalid parameter.\n");
        return -1;
    }

    for (int i = stack->stackTop; i != -1; i--)
    {
        printf("%d ", stack->data[i]);
    }
    printf("\n");
    return 0;
}

main.c

#include <stdio.h>
#include "SqStack.h"

void test_StackPush();
void test_StackPop();
void test_StackClear();

int main(int argc, char const *argv[])
{
    // test_StackPush();
    // test_StackPop();
    test_StackClear();
    return 0;
}

void test_StackPush()
{
    pSqStack s = StackCreate(5);
    StackPush(s, 1);
    StackPush(s, 2);
    StackPush(s, 3);
    StackPush(s, 4);
    StackPush(s, 5);
    StackShow(s);
}

void test_StackPop()
{
    pSqStack s = StackCreate(5);
    StackPush(s, 1);
    StackPush(s, 2);
    StackPush(s, 3);
    StackPush(s, 4);
    StackPush(s, 5);
    StackShow(s);

    StackPop(s);
    StackShow(s);
}

void test_StackClear()
{
    pSqStack s = StackCreate(5);
    StackPush(s, 1);
    StackPush(s, 2);
    StackPush(s, 3);
    StackPush(s, 4);
    StackPush(s, 5);
    StackShow(s);

    StackClear(s);
    StackShow(s);
}