I’m trying to simply record a file’s properties by making a vector of objects. It works just fine when the vector is a vector of objects, but when the vector is object pointers, the outcome is a bunch of garbage value.

the outcome with object vector:

1 Computer Engineering
2 Electrical Engineering
3 Chemical Engineering

the outcome with object pointer vector:

3 �Kҍa�c��  feering
3 �Kҍa�c��  feering
3 �Kҍa�c��  feering

and it changes every time.

this is the piece of code that produces that error:

#include <iostream>
#include <vector>
#include <utility>
#include <sstream>
#include <fstream>
#include <string>

using namespace std;

class Major
{
private:
    int id;
    string name;

public:
    Major(int major_id, string major_name)
    {
        id = major_id;
        name = major_name;
    }
    void revealMajorInfo()
    {
        cout << id << ' ' << name << endl;
    }
};

int main(int argc, char *argv[])
{
    string current_exec_name = argv[0];
    vector<string> file_paths;
    if (argc > 1)
    {
        file_paths.assign(argv + 1, argv + argc);
    }
    fstream major_file;
    major_file.open(file_paths[0], ios::in);
    vector<string> properties;
    vector<vector<string>> properties_details;
    string line, word;
    while (getline(major_file, line))
    {
        properties.clear();
        stringstream major_line(line);
        while (getline(major_line, word, ','))
        {
            properties.push_back(word);
        }
        properties_details.push_back(properties);
    }
    vector<Major *> majors;
    for (int i = 0; i < properties_details.size(); i++)
    {
        Major major1(stoi(properties_details[i][0]), properties_details[i][1]);
        major1.revealMajorInfo();
        majors.push_back(&major1);
    }
    for(int j = 0; j < majors.size(); j++)
    {
        majors[j]->revealMajorInfo();
    }
}

and this is the code that doesn’t produce an error:

#include <iostream>
#include <vector>
#include <utility>
#include <sstream>
#include <fstream>
#include <string>

using namespace std;

class Major
{
private:
    int id;
    string name;

public:
    Major(int major_id, string major_name)
    {
        id = major_id;
        name = major_name;
    }
    void revealMajorInfo()
    {
        cout << id << ' ' << name << endl;
    }
};

int main(int argc, char *argv[])
{
    string current_exec_name = argv[0];
    vector<string> file_paths;
    if (argc > 1)
    {
        file_paths.assign(argv + 1, argv + argc);
    }
    fstream major_file;
    major_file.open(file_paths[0], ios::in);
    vector<string> properties;
    vector<vector<string>> properties_details;
    string line, word;
    while (getline(major_file, line))
    {
        properties.clear();
        stringstream major_line(line);
        while (getline(major_line, word, ','))
        {
            properties.push_back(word);
        }
    }
    Major major1(stoi(properties_details[0]), properties_details[1]);
    major1.revealMajorInfo();
    Major* major2 = &major1;
    major2->revealMajorinfor();
}

any help would be appreciated.