public static void Main()
Console.WriteLine("Hello World");
class CollegeStudent : Student
public CollegeStudent(string name, int age, string hobby, string major) : base(name, age, hobby)
public override string GetSayHelloWords()
s += "helo, my name is " + Name + ",\r\n";
s += "I anm " + Age + " years old, and my major is " + _major + " ,\r\n";
s += "I like " + Hobby + " , thanks \r\n";
public Student(string name, int age, string hobby)
Console.WriteLine(GetSayHelloWords());
public virtual string GetSayHelloWords()
s += "helo, my name is " + _name + ",\r\n";
s += "I anm " + _age + " years old, \r\n";
s += "I like " + _hobby + " , thanks \r\n";