How to use a struct inside another struct?

Question

I want to use a nested structure but i dont know how to enter data in it, for example:

struct A {
    int data;
    struct B;
};
struct B {
    int number;
};
         


        

Answer 1

struct A {
    struct B {
       int number;
    };
    B b;
    int data;
};
int main() {
    A a;
    a.b.number;
    a.data;
}