Field in C++

In C++, a field is a data member of a class that can hold the state or attributes of an object of that class. Fields are declared within the class definition, and can have different access levels (public, private, or protected) which determine the visibility of the field outside the class.

Here's an example of how to declare and use fields in a class in C++:

``c++ class Person { public: string name; // a public field


private:

    int age;         // a private field
public:

    void setAge(int newAge) {

        age = newAge;

    }
void printDetails() {

        cout << "Name: " << name << "\n";

        cout << "Age: " << age << "\n";

    }

};



In this example, we have a Person class with two fields - name and age. name is declared as a public field, which means it can be accessed from outside the class. age is a private field, which means it can only be accessed from within the class.
The class also has two methods - setAge() and printDetails(). setAge() is a public method that allows us to modify the value of the age field. printDetails() is also a public method, and it prints out the values of both fields.

To use this class, we can create an object of type Person and set its fields:

 c++

Person john;

john.name = "John";     // set the name field directly

john.setAge(30);        // call the setAge() method to set the age field



We can then call the printDetails() method to print out the values of both fields:
 c++

john.printDetails();    // prints "Name: John\nAge: 30\n"

Note that we were able to access the name field directly since it was declared as a public field. However, we had to use the setAge() method to modify the age` field, since it was declared as a private field.

Field in C++

See this concept in other languages