问警告:删除数组“.”munmap_chunk()：无效指针命令被信号6终止

EN

#include<iostream>
using namespace std;

//This class gets rollNo, name, marks for 3 subjects....
class Student
{
    private:
        int rollNumber;
        string name;
        int marks[3];
        
    public:
        
        void setRollnumber(int roll)
        {
            rollNumber = roll;
        }
        
        void setName(string name)
        {
            this->name = name;
        }
        
        void setMarks(int marks1, int marks2, int marks3)
        {
            this -> marks[0] = marks1;
            this -> marks[1] = marks2;
            this -> marks[2] = marks3;
        }
        
        int totalMarks();
        
        char grade(int totalMarks, int maxMarks);
        
        ~Student();
        
};
//Finds the total marks...
int Student :: totalMarks()
{
    int total = 0;
    
    for(int i=0; i<3; i++)
    {
        total += marks[i];
    }
    
    return total;
    
}
//Returns the grade...
char Student :: grade(int totalMarks, int maxMarks)
{
    float percent = ((float)totalMarks / (float)maxMarks) * 100;
    
    char grade;
    grade = percent >= 90 ? 'A' : (percent >= 75) ? 'B' : (percent >= 50) ? 'C' : 'F';
    
    return grade;
}

//Destructor....
Student :: ~Student()
{
    delete &rollNumber;
    delete &name;
    delete[] marks; 
}

int main(){
    
    Student bee;
    
    bee.setRollnumber(50);
    bee.setName("Bee");
    bee.setMarks(90, 80, 70);
    
    int total_marks_scored = bee.totalMarks();
    
    cout<<"Total Marks    : "<<total_marks_scored<<endl;
    cout<<"Grade Obtained : "<<bee.grade(total_marks_scored, 300);
    
    return 0;
    
}