每次都是按着书上的代码打上去的，用的dve- c++，但只要用#include<string.h>软件就自动跳出<string.h>的所有代码，弄的都不能运行，不知道怎么解决。

求有经验的能帮帮我解决啊,一直都不知道怎么弄。拜托！！！

#include<iostream>
#include<string.h>
using namespace std;
class CClass
{
    public:
        CClass(char *cName="",int snum=0);
        ~CClass()
        {
            cout<<"析构班级:"<<pname<<endl;
            delete pname;
        }        
        CClass(CClass &p)
        {
            pname=new char[strlen(p.pname)+1];
            if(pname!=0)
                strcpy(pname,p.pname);
            num=p.num;
            cout<<"创建班级的拷贝:"<<pname<<endl;
        }
        void Print();
    private:
        char*pname;
        int num;
}
CClass::CClass(char*cName,int snum)
{
    int length=strlen[cName];
    pname=new char[length+1];
    if(pname!=0)
    {
        strcpy(pname,cName);
    }
    num=snum;
    cout<<"创建班级:"<<pname<<endl;
}
void CClass::Print()
{
    cout<<pname<<"班的班级人数:"<<num<<endl;
}
int main
{
    CClass c1("三年一班",65);
    CClass c2(c1);
    c1.Print();
    c2.Print();
    return 0;
}

#include<iostream>
#include<string.h>
using namespace std;
class CClass
{
    public:
        CClass(char *cName="",int snum=0);
        ~CClass()
        {
            cout<<"析构班级:"<<pname<<endl;
            delete pname;
        }        
        CClass(CClass &p)
        {
            pname=new char[strlen(p.pname)+1];
            if(pname!=0)
                strcpy(pname,p.pname);
            num=p.num;
            cout<<"创建班级的拷贝:"<<pname<<endl;
        }
        void Print();
    private:
        char*pname;
        int num;
}
CClass::CClass(char*cName,int snum)
{
    int length=strlen[cName];
    pname=new char[length+1];
    if(pname!=0)
    {
        strcpy(pname,cName);
    }
    num=snum;
    cout<<"创建班级:"<<pname<<endl;
}
void CClass::Print()
{
    cout<<pname<<"班的班级人数:"<<num<<endl;
}
int main
{
    CClass c1("三年一班",65);
    CClass c2(c1);
    c1.Print();
    c2.Print();
    return 0;
}

不知道是不是我电脑的问题，每次只要用了string.h的头文件就会有这个问题

可是我这个程序确实是c++的程序，因为想用strlen（）函数，那我应该怎么做啊，不包含头文件的话好像会出错