What is the size of an object of an empty class in C++?
The following is an example to find the size of object of an empty class.
Example
Live Demo
#include <bits/stdc++.h>
using namespace std;
class p1 {
public:
void first() {
cout << "\nThe parent class p1 function is called.";
}
};
class p2
{ };
int main() {
cout << "The size of non-empty class p1 = " << sizeof(p1);
cout << "\nThe size of empty class p2 = " << sizeof(p2);
p2 p;
cout << "\nThe size of object of empty class p2 = " << sizeof(p);
p1 o;
cout << "\nThe size of object of non-empty class p1 = " << sizeof(o);
return 0;
}Output
The size of non-empty class p1 = 1
The size of empty class p2 = 1
The size of object of empty class p2 = 1
The size of object of non-empty class p1 = 1
In the above program, an empty class p2 is created.
class p2
{ };The size of classes and objects is printed as follows −
cout << "The size of non-empty class p1 : " << sizeof(p1);
cout << "\nThe size of empty class p2 : " << sizeof(p2);
p2 p;
cout << "\nThe size of object of empty class : " << sizeof(p);
p1 o;
cout << "\nThe size of object of non-empty class p1 : " << sizeof(o);
Published on 08-Nov-2018 10:54:36
