class Child { private int age; private string name; // Default constructor: public Child() { name = "N/A"; } // Constructor: public Child(string name, int age) { this.name = name; this.age = age; } // Printing method: public void PrintChild() { Console.WriteLine("{0}, {1} years old.", name, age); } } class StringTest { static void Main() { // Create objects by using the new operator: Child child1 = new Child("Craig", 11); Child child2 = new Child("Sally", 10); // Create an object using the default constructor: Child child3 = new Child(); // Display results: Console.Write("Child #1: "); child1.PrintChild(); Console.Write("Child #2: "); child2.PrintChild(); Console.Write("Child #3: "); child3.PrintChild(); } } /* Output: Child #1: Craig, 11 years old. Child #2: Sally, 10 years old. Child #3: N/A, 0 years old. */