#include <iostream>
using namespace std;
int sum(int x, int y, int z = 0, int w = 0)
{
return (x + y + z + w);
}
int main()
cout << sum(10, 15) << endl;
cout << sum(10, 15, 25) << endl;
cout << sum(10, 15, 25, 30) << endl;
return 0;
class Parent { public Parent() { System.out.println("Parent Constrcutor"); } } class Child extend...
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