数据结构C语言实现----出栈操作

代码如下：

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

typedef struct 
{
    char *base;
    char *top;
    int stacksize;
}sqStack;

//////////////////////////////////////
//创建一个栈
#define STACK_SIZE 100
void initstack(sqStack *stack )
{
    stack->base = (char*)malloc( STACK_SIZE * sizeof(char));
    if (!stack->base)
    {
        exit(0);
    }
    stack->top = stack->base;
    stack->stacksize = STACK_SIZE;
}
////////////////////////////////////
//入栈操作
#define STACK_MORE 10
void Push(sqStack *stack , char c)
{
    if (stack->top - stack->base > stack->stacksize)
    {
        stack->base = (char*)realloc(stack->base , (stack->stacksize + STACK_MORE) * sizeof(char));
        if (!stack->base)
        {
            exit(0);
        }
        
        stack->top = stack->base + stack->stacksize;
        stack->stacksize = stack->stacksize + STACK_MORE;
    }
    *(stack->top) = c;
    stack->top++;
}
//////////////////////////////////////
//出栈操作
void Pop(sqStack *stack , char *c)
{
    if (stack->base == stack->top)
    {
        return;
    }
    *c = *--(stack->top);
}

int main()
{
    sqStack stack;
    char c=1;
    printf("请安任意键创建一个栈...
");
    getchar();
    initstack(&stack);
    printf("创建成功！
");
    printf("请输入要压入栈的一个字符串(读取到0截至)： ");
    while ((c = getchar()) != '
')
    {
        //scanf("%c",&c);
        //fflush(stdin);
        if (c!='
')
        {
            Push(&stack , c);
        }
    }
    printf("压入字符完成，正在打印字符串...
");
    for (size_t i = 0; i < (stack.top - stack.base); i++)
    {
        printf("%c",*(stack.base + i));
    }
    putchar('
');
    printf("请输入要弹出几个字符：");
    int k;
    scanf("%d",&k);
    while (k)
    {
        k--;
        Pop(&stack , &c);
        printf("字符%c已弹出！
",c);
    }
    printf("弹出字符完成，正在打印字符串...
");
    for (size_t i = 0; i < (stack.top - stack.base); i++)
    {
        printf("%c",*(stack.base + i));
    }
    putchar('
');
    return 0;
}

　　

运行结果：