#include <iostream.h> #include <string.h> class CStudent { public: CStudent(char *n, int a); ~CStudent(); static void SetAge(int age); private: char *name; int age; static int nTotalObj; }; int CStudent::nTotalObj = 0; CStudent::CStudent(char *n, int a) :age(a) { int nLen = strlen(n); name = new char[nLen+1]; strcpy(name,n); name[nLen] = '\0'; nTotalObj++; } CStudent::~CStudent() { delete[] name; nTotalObj--; } void CStudent::SetAge(int age) { this->age = age; } void main() { CStudent stu1("张三",25); CStudent str2("李四",26); cout<<"CStudent::nTotalObj="<<CStudent::nTotalObj<<endl; }问题三：如果不改变主函数和类 CStudent 中的成员变量的属性，应该如何改正该程序？

这个程序存在一个问题，就是在类 CStudent 中定义的 name 和 age 成员变量没有进行释放，会导致内存泄漏。解决方法是在类的析构函数中释放这些成员变量。

修改后的代码如下：

#include <iostream.h>
#include <string.h>

class CStudent {
public:
    CStudent(char *n, int a);
    ~CStudent();
    static void SetAge(int age);

private:
    char *name;
    int age;
    static int nTotalObj;
};

int CStudent::nTotalObj = 0;

CStudent::CStudent(char *n, int a) : age(a) {
    int nLen = strlen(n);
    name = new char[nLen + 1];
    strcpy(name, n);
    name[nLen] = '\0';
    nTotalObj++;
}

CStudent::~CStudent() {
    delete[] name;
    nTotalObj--;
}

void CStudent::SetAge(int age) {
    this->age = age;
}

void main() {
    CStudent stu1("张三", 25);
    CStudent str2("李四", 26);
    cout << "CStudent::nTotalObj=" << CStudent::nTotalObj << endl;
}

这样就能保证在对象被销毁时，其成员变量占用的内存也会被释放，避免了内存泄漏的问题。