Practice Questions For

ANS : (c) In C++, local variables are not initialized by default, leading to undefined behavior.

ANS : (c) string is a class in C++, not a primitive data type.

ANS : (a) The size of a char in C++ is 1 byte.

ANS : (b) The const keyword is used to define a constant variable in C++.

ANS : (a) The + operator is used for concatenating strings in C++.

ANS : (a) The output will be 3 because both operands are integers.

ANS : (a) The cin object is used to take input in C++.

ANS : (c) The correct way to declare an array in C++ is int arr[] = new int[5];.

ANS : (b) The correct syntax to create an object in C++ is ClassName obj = new ClassName();.

ANS : (a) The this keyword refers to the current instance of the class.

ANS : (c) Both // and /* */ are valid ways to comment in C++.

ANS : (a) The output will be Hello5.

ANS : (c) Both try-catch and throw are used to handle exceptions in C++.

ANS : (a) A C++ class holds both data members and member functions.

ANS : (d) All of the above are features of Object-Oriented Programming in C++.

ANS : (c) The destructor is used to free resources when an object goes out of scope.

ANS : (a) The correct way to declare a pointer in C++ is int *ptr;.

ANS : (a) The output will be 16 because (5 + 3) * 2 = 16.

ANS : (d) All of the above are valid ways to define a function in C++.

ANS : (c) The static keyword is used to create both static variables and static functions.

ANS : (a) cout << "Hello World"; is the correct syntax in C++.

ANS : (b) 'iostream' is the header file required for using cout in C++.

ANS : (c) const int x = 10; is the correct way to declare a constant in C++.

ANS : (c) The 'new' operator is used to allocate memory dynamically in C++.

ANS : (d) The size of 'int' can vary depending on the system and compiler.

ANS : (b) Integer division in C++ gives 2.

ANS : (a) The keyword 'class' is used to define a class in C++.

ANS : (a) Correct array initialization in C++ is: int arr[3] = {1, 2, 3};

ANS : (d) Colon (:) is used to inherit a class in C++.

ANS : (a) ~ClassName(); is the correct way to declare a destructor.

ANS : (c) 'internal' is not a valid access specifier in C++.

ANS : (b) Function overloading is supported with same name and different parameters.

ANS : (b) The default return type in older C++ standards is int.

ANS : (d) A constructor has all these properties.

ANS : (b) 'cin' is used for user input in C++.

ANS : (c) do-while executes body first, then checks condition.

ANS : (b) :: is the scope resolution operator in C++.

ANS : (b) 'this' pointer refers to the current object.

ANS : (b) .cpp is the standard extension for C++ source files.

ANS : (b) Inheritance allows code reuse by deriving new classes.

ANS : (a) Polymorphism means having multiple forms of the same function or operator.

ANS : (c) The 'new' operator is used for dynamic memory allocation in C++.

ANS : (b) Identifiers can start with an underscore or a letter, but not with a digit or symbol.

ANS : (b) On most 32-bit systems, 'int' typically occupies 4 bytes.

ANS : (b) Encapsulation hides the internal details of an object from outside interference.

ANS : (a) 'iostream' is used for standard input/output operations in C++.

ANS : (d) All of the above statements are true about 'return 0;'.

ANS : (b) A reference variable is an alias or alternate name for another variable.

ANS : (c) Compilation is a process, not a feature of OOP.

ANS : (c) Upcasting allows treating derived class objects as base class objects.

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