[Solved] Can anyone explain me how above code works and using which concept?

by


I commented the code for you and made it a bit more clear to read.
Read the comments from (1) -> (5).

#include <iostream>

using namespace std;

class A {

public:
    A(int x) // (3): gets called by f to initialize an object of class A with x=1
    {
        a = x;
    }

    int a;
};

void fun(A temp) // (2): Assumes 1 is a type class A. But it hasn't yet been initialized. So it calls Constructor. (tmp = new A(1))
{
    // (4): Now temp is an object of class A
    cout << temp.a << endl; // Prints temp.a
    // (5): temp object is getting destroyed.
}

int main()
{
    fun(1); // (1): Calls fun() with argument of 1
}

solved Can anyone explain me how above code works and using which concept?