Having trouble with objects and classes in C++

So, I defined the method displayStudInfo in the 'Student' Class and called it in the main function. But I'm getting the error "Function not declared in this scope". Can anyone please tell me why this is happening and what I can do to solve this problem?

#include <iostream>
#include <string>
using namespace std;


class Student{

  public:
    int age;
    string name;


    void enterInfo(){

    cout << "Enter your age = " ; cin >> age;
    cout << "Enter your name = "; cin >> name;

    }


    void displayStudInfo(Student s)
    {
        cout << "Age = " << s.age << ", name=" << s.name << endl;
    }

};




int main(){

    int size;
    Student stud[100];
    Student abir;

    abir.enterInfo();
    displayStudInfo(abir);

}