数据结构C语言括号的检验源程序

#include
#include
using namespace std;
#define Maxsize 50
class stack
{
private:
char *st;
int top;
public:
stack()
{
top=-1;
st=new char[Maxsize];
}
void clear()
{
top=-1;
}
bool isempty()
{
if(top==-1)
return true;
else
return false;
}
bool isfull()
{
if(top==Maxsize-1)
return true;
else
return false;
}
bool push(int item)
{
if(top==Maxsize-1)
{
cout