//2014.10.02 顺序栈的实现方式
#include<iostream>
#include<math.h>
#include"assert.h"
using namespace std;
#define INCREMENT_SIZE 2
typedef struct STACK
{
int stacksize;
int* pstop; //栈顶指针p表示指针s表示栈
int* psbottom;
}STACK;
void init_stack(STACK& s)
{
s.stacksize = INCREMENT_SIZE;
//注意加1的原因:s.psbottom不存放数据本身要占据一个字节的空间
s.pstop = s.psbottom =(int*)malloc(sizeof(int)*(s.stacksize+1));
if(NULL == s.pstop)
{
cout<<"为栈分配存储空间失败";
return;
}
}
bool push(STACK& s,int val)
{
int k = s.pstop-s.psbottom;
if((s.pstop-s.psbottom)>=s.stacksize)
{
//注意加1的原因:s.psbottom不存放数据本身要占据一个字节的空间
s.psbottom = (int*)realloc(s.psbottom ,sizeof(int)*(s.stacksize+INCREMENT_SIZE+1));
if(NULL == s.psbottom)
{
cout<<"栈已满,为将要压栈的元素分配内存失败"<<endl;
return false;
}
s.pstop = s.psbottom+s.stacksize;
s.stacksize+=INCREMENT_SIZE;
}
s.pstop++;
*s.pstop = val;
return true;
}
bool pop(STACK& s,int& val)
{
if(s.psbottom == s.pstop)
{
cout<<"栈为空出栈失败"<<endl;
return false;
}
val = *s.pstop--;
return true;
}
void dis_stack(STACK& s)
{
if(s.pstop == s.psbottom)
{
cout<<"栈为空"<<endl;
return ;
}
int* p = s.pstop ;
while(p != s.psbottom)
{
cout<<*p<<endl;
p--;
}
}
bool get_top(STACK&s, int& val)
{
if(s.psbottom == s.pstop)
{
cout<<"栈为空"<<endl;
return false;
}
val = *s.pstop;
return true;
}
STACK stack;
int main(void)
{
init_stack(stack);
push(stack,23);
push(stack,78);
push(stack,26);
push(stack,90);
push(stack,45);
push(stack,45);
push(stack,78);
push(stack,123);
dis_stack(stack);
int val = 0;
cout<<endl;
pop(stack,val);
cout<<val<<endl;
cout<<endl;
pop(stack,val);
cout<<val<<endl;
cout<<endl;
dis_stack(stack);
int top_val;
get_top(stack,top_val);
cout<<endl;
cout<<top_val<<endl;
return 0;
}
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