类中c ++析构函数的xCode问题

我仍在学习c ++，现在尝试了解构造函数和析构函数。

每当我使用构造函数和析构函数时，我只会不断收到以下错误。在我班上。

测试（32992,0x100394380）malloc：*对象0x100707010的错误：未分配要释放的指针*在malloc_error_break中设置一个断点以进行调试（lldb）

尽管我可以通过删除Destructor来消除错误，但是我知道这不是一个很好的编程，因为我必须释放内存。

这是我的代码。

#include <iostream>
using namespace std;



class student{
private:
    int *age, *mark1,*mark2,*mark3;
    string *name;

public:
    friend float avg(student);
    student(){
        age = new int;
        mark1 = new int;
        mark2 = new int;
        mark3 = new int;
        name = new string;

        cout << "Enter student name: "; cin >> *name;
        cout << "Enter student age: "; cin >> *age;
        cout << "Enter student 3 marks: "; cin >> *mark1 >> *mark2 >> *mark3;
        cout << endl; }

    ~student(){
        delete age;
        delete mark1;
        delete mark2;
        delete mark3;
        delete name; }

    string returnName(){
        return *name; }
};

float avg(student s){
    return (double)(*s.mark1+*s.mark2+*s.mark3)/3;}




int main() {

    student s[2];

    for (int i = 0; i < 2; i++) {
        s[i];
        cout << "Avg of student " << s[i].returnName() << " is " << avg(s[i]) << endl;
    }
}