运行旧代码或某些旧版本的Microsoft Visual Studio

成绩册22.cpp

    #include "GradeBook22.h"
#include <iostream>
#include <string>

GradeBook::GradeBook(string name) {
    setCourseName(name);
}

void GradeBook::displayMessage() {
    cout << "Welcome to the grade book for " << getCourseName() << endl;
}

void GradeBook::setCourseName(string newName) {
    if (courseName.length() <= 25) courseName = newName;
    else {
        courseName = newName.substr(0, 25);
        cout << "Name \"" << newName << "\" exceeds maximum length (25).\n"
            << "Limiting courseName to first 25 characters.\n" << endl;
    }
}

string GradeBook::getCourseName() {
    return courseName;
}

成绩册22.h

#pragma once
#include <iostream>
#include <string>
using std::cin;
using std::cout;
using std::endl;
using std::string;

class GradeBook {
public:
    // Costruttore
    GradeBook(string name);
    void displayMessage();
    void setCourseName(string newName);
    string getCourseName();

private:
    string courseName;
};

主.cpp

#include <iostream>
#include "GradeBook22.h"

int main()
{
    GradeBook GradeBook1("CS101 Introduction to programmingggggggggggggggggggggggggggggggggggggggggggg");
    GradeBook1.setCourseName("CS101 Introduction to programmingggggggggggggggggggggggggggg");
    GradeBook GradeBook2("CS102 Data Structures in C++");
    cout << "GradeBook1 created for course: " << GradeBook1.getCourseName() << "\nGradeBook2 created for course: " << GradeBook2.getCourseName() << endl;

    return 0;
}

我从一本书中学习了这个简单的程序，我正在使用Microsoft Visual Studio 2022用C++编写代码。

我不明白为什么只有当我添加了第二个

GradeBook1.setCourseName("CS101 Introduction to programmingggggggggggggggggggggggggggg");

而构造函数应该已经调用了函数.setCourseName（）

我尝试过包括头文件、更正构建财产，比如检查构建、重新启动MVS、关闭并重新打开解决方案、复制解决方案，但在我看来，这是一个错误。

我还能做什么？