Write a program that will demonstrate object as function argument pass by value

Write a program that will demonstrate object as function argument pass by value. The program that uses the following properties - class name- objarg, two integer type private member variable- a, b. Three public member function - input_add_val(int c, int d), alter_sign(objorg x), show(). input_add_val(int c, int d) get the value from main() and do the addition operation for a and b. show() function will displays the addition result as output. alter_sign(objorg x) change the sign of addition result.

#include<iostream>

using namespace std;

class objarg

{

    int a,b;

public:

    int input_add_val(int c,int d);

    int alter_sign(objarg x);

    int show();

};

int objarg::input_add_val(int c,int d)

{

    a=c;

    b=d;

}

int objarg::show()

{

    cout<<"Addition is: "<<a+b<<endl;

}

int objarg::alter_sign(objarg x)

    {

        x.a=-x.a;

        x.b=-x.b;

        cout<<"Additio of changes is : "<<x.a+x.b<<endl;

    }

int main()

{

    objarg r;

    r.input_add_val(25,25);

    cout<<"Before changes"<<endl;

    r.show();

    cout<<"After changes "<<endl;

    r.alter_sign(r);

    return 0;

}