构造函数与析构函数的使用c++

代码如下：如有帮助，请采纳一下，谢谢。

#include <iostream>
using namespace std;
class Student
{
private:
	char *mId;
	char *mName;
	int mScoreMath;
	int mScoreEng;
	int mScoreC;
public:
	Student(){mId=0;mName =0;}
	
	Student(char* id,char* name,int m,int e,int c)
	{
		mId = new char(strlen(id)+1);
		memcpy(mId,id,strlen(id));
		mId[strlen(id)] = 0;
		
		mName = new char(strlen(name)+1);
		memcpy(mName,name,strlen(name));
		mName[strlen(name)] = 0;

		mScoreMath=m;mScoreEng=e;mScoreC=c;
	}
	~Student(){if(mId) delete[] mId;mId = 0;if(mName) delete[] mName;mName = 0;}
	void setScore(int m,int e,int c){mScoreMath = m;mScoreEng = e;mScoreC = c;}
	float average()	{return (mScoreC + mScoreEng + mScoreMath)/3.0;}
	int sum(){return mScoreC + mScoreEng + mScoreMath;}
	void print(){cout << "学号:" << mId <<"  姓名:" << mName << "  数学:" << mScoreMath<< "  英语:" << mScoreEng << "  C语言:" << mScoreC <<endl;}
};
int main()
{
	Student st("1001","张三",88,98,89);
	cout << "平均分:" << st.average() << endl;
	cout << "总分:" << st.sum() << endl;
	st.print();
	return 0;
}

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