我们先来看看下面的代码：
#include<iostream>
#include<fstream>
#include<cstdlib>
using namespace std;
class CntCharacters
{
private:
int cnt;
public:
CntCharacters():cnt(0){}
~CntCharacters(){}
void opentxt(char* p)
{
ifstream fin;
fin.open(p,ios_base::in);
if(!fin.is_open())
{
co
