c++ to calculate the sum of 2 interger no. by using constructor concept

//wap to calculate the sum of 2 interger no. by using constructor concept
#include<iostream>
using namespace std;
class sum
{
int a,b,s;
public:
sum(int ,int );
void display();
};
sum::sum(int x ,int y)
{
a=x;
b=y;
s=a+b;
}
void sum::display()
{
cout<<"The sum is : "<<s<<"\n";
}

int main()
{
sum ad=sum(10,20);
ad.display();
return (0);
}

OUT- The sum is : 30

//Add two number using constructor without display function.

#include<iostream>

using namespace std;

//class containing methods and variables.

class add

{

    int num1,num2,sum;

    public :

    add(int x,int y);

    

  

};

//defining methods using scope resolution opertor.

add::add(int x,int y)

{

num1=x;

num2=y;

    sum=x+y;

    cout<<"The sum is : "<<sum<<"\n";

}

int main()

{

    add b=add(10,20);

    

}

    OUT- The sum is : 30