default access modifier in c++ in struct

In C++, the default access modifier in a struct is public. The access modifiers in C++ are used to specify the visibility or accessibility of class members (variables and functions) from different parts of the program.

By default, when you define a struct in C++, all its members are public. This means that the members of the struct can be accessed from anywhere in the program.

To illustrate this, here is an example:

struct MyStruct {
    int publicVariable;
    void publicFunction() {
        // code goes here
    }
};

int main() {
    MyStruct myObject;
    myObject.publicVariable = 10;
    myObject.publicFunction();
    return 0;
}

In the above example, the struct MyStruct has a public integer variable publicVariable and a public void function publicFunction. These members can be accessed directly from the main function without any restrictions.

It's important to note that the default access modifier for classes in C++ is private, which means that all the members of a class are private by default. However, for structs, the default access modifier is public.

If you want to explicitly specify a different access modifier for the members of a struct, you can use the private or protected keywords before the member declarations. For example:

struct MyStruct {
    int publicVariable;
private:
    int privateVariable;
protected:
    int protectedVariable;
};

In the above example, publicVariable is still public, but privateVariable is private and protectedVariable is protected. This means that privateVariable can only be accessed within the struct, while protectedVariable can be accessed within the struct and its derived classes.

I hope this explanation helps! Let me know if you have any further questions.