What is the output of the following program? #include using namespace std; class testclass { public: testclass(int x) { cout < < x < < endl; } testclass() { cout < < "hello! " < < endl; } }; int main() { testclass test; return 0; }

The answer is "Hello!".

Explanation:

In the given C++ language program, a class "TestClass " is defined, which contains a parameterized constructor and default constructor. In the parameterized constructor an integer variable "x" is passed in the constructor parameter and inside a constructor parameter value is print. Inside the default constructor, a print function (cout) is used that print message "Hello!".In the main method, a class "TestClass" object is created that is "test" when a class object is created it automatically called a default constructor that's why the output to this code is "Hello!".

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