Question

Is int a class?

Please consider below code

#include"iostream"

using namespace std;

class test{
public:
    int a;

    test(int x)
    {
        cout<<"In test Constructor"<<endl;
        a = x;
    }
};

int main()
{
    test *obj = new test(10);// Constructor get called 
int *x = new int(10);    // Expecting the same if "int" is a class
return 0;
}

Answer 1

No, int is not a class, and int x = new int(10); is not valid C++ syntax.

int* x = new int(5);
...
...
delete x;

This just creates a pointer to an int and new int(5) is a way to initialize a pointer.

And the correct way should be delete[] x;

No, because you allocated it with new, not new[]. The correct way though is int x = 5; or int x(5); – avoid dynamic allocation unless truly necessary.