Object Oriented Programming Using C Plus Plus — Part 1 MCQs with Explanations

A. True. C++ is a multi-paradigm programming language, which means it supports multiple programming paradigms, including procedural and object-oriented programming. Procedural programming is a programming paradigm that emphasizes the use of procedures or functions to organize the program into small, reusable blocks of code. C++ supports procedural programming through the use of functions, structures, and arrays. Object-oriented programming, on the other hand, is a programming paradigm that emphasizes the use of objects, which are instances of classes, to organize the program. C++ supports object-oriented programming through the use of classes, inheritance, polymorphism, and other object-oriented concepts. Thus, C++ can be used as both a procedural and an object-oriented language, depending on the needs of the programmer and the requirements of the problem being solved.

Correct Answer: A: optional Here's why: In a `switch` statement, the `break` statement is optional . How a `switch` works (Simplified): A `switch` statement checks a variable against different `case` values. If a `case` matches, the code under that `case` starts executing. `break`'s role: The `break` statement tells the program to immediately exit the `switch` statement . What happens without `break`? If you *don't* include a `break` after a `case`, the program will "fall through" to the next `case` and continue executing code there, even if that next `case` doesn't match the original variable's value. This "fall-through" behavior can be useful in some situations, but often you want to execute only the code associated with a single `case`. Example: Imagine a traffic light. `switch (trafficLightColor)` { `case "red":` `Stop();` `break;` // Without this, it might also execute the "yellow" code! `case "yellow":` `SlowDown();` `break;` `case "green":` `Go();` `break;` `}` So, while `break` is very common and important for controlling the flow of execution in a `switch`, it's not required by the C++ language . The program will still compile and run (though perhaps not as intended) without it.

In the given expression, we have two conditions connected by the logical OR operator ( || ): - 4 > 6 : This condition is false because 4 is not greater than 6. - 10 < 2 * 6 : This condition is true because 10 is less than 12 (2 multiplied by 6). The logical OR operator ( || ) returns true if at least one of the conditions is true. In this case, the second condition is true, so the overall expression is true. So, the correct answer is Option A: True .

Static data members in C++ are special variables associated with a class, not individual objects of that class. This means there's only one copy of the static member shared by all objects of the class. Because of this shared nature, you can't initialize them directly within the class declaration like regular member variables. Instead, you need to give them a value outside the class definition. This is done typically by providing an initialization outside the class, often in the same header file or a separate source file. Therefore, the correct answer is that a static data member is given a value outside the class definition .

The insertion operator in C++ is used to insert data into an output stream, such as cout . Option A: >> - This is the extraction operator, used to extract data from an input stream, such as cin . Option B: << - This is the insertion operator, used to insert data into an output stream, such as cout . Option C: // - This denotes a single-line comment in C++. Option D: / - This denotes the beginning of a multi-line comment in C++, which ends with / . Option E: both (a) and (b) - This is incorrect because only Option B: << is the insertion operator. Therefore, the correct answer is Option B: << .

sqrt is a function from the C++ standard library that calculates the square root of a given number. In this case, the expression sqrt(16) calculates the square root of 16. The function pow from the C++ standard library calculates the power of a number, i.e., it raises a number to a specified power. The expression pow(16, 2) calculates 16 raised to the power of 2, which is 256, and is not the square root of 16. sqroot is not a standard C++ function and will result in a compile-time error. sqrt (16, 2) is not a correct syntax for the sqrt function in C++, which takes only one argument, the number for which the square root is to be calculated. So, the correct expression to find the square root of 16 in C++ is sqrt(16) . C++ program to find out square root of 16 #include <iostream> #include <cmath> using namespace std; int main() { cout << "Square root of 16 = "; // print the square root of 16 cout << sqrt(16); return 0; } Here is an explanation of the code: 1. #include <iostream> - This line includes the input/output stream library, which provides the cout function that is used later in the code to print the output. 2. #include <cmath> - This line includes the C++ mathematics library, which provides mathematical functions such as sqrt() that is used later in the code to calculate the square root. 3. using namespace std; - This line is used to make all the elements of the standard C++ library available to the program. 4. int main() - This is the main function of the program. All C++ programs must have a main function, which is where the program starts executing. 4. cout << "Square root of 16 = "; - This line outputs the string "Square root of 16 =" to the console. 6. cout << sqrt(16); - This line calculates the square root of 16 using the sqrt() function from the C++ mathematics library and outputs the result to the console. 7. return 0; - This line is the return statement of the main function. It returns 0, indicating that the program has executed successfully. In summary, this program calculates the square root of 16 and outputs the result to the console.

any thrown object that has not been caught by an earlier catch block is the correct answer to “A default catch block catches”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

False is the correct answer to “Adding a derived class to a base class requires fundamental changes to the base class”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

the bitwise OR operator (|) is the correct answer to “Format flags may be combined using”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

public is the correct answer to “To expose a data member to the program, you must declare the data member in the _____ section of the class”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

False is the correct answer to “Evaluate the following expression: 3 >6&&7>4”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

None of the above is the correct answer to “Which of the following are valid characters for a numeric literal constant”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

manipulator is the correct answer to “A function that changes the state of the cout object is called a(n) _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

int function(int d, char c) is the correct answer to “A C++ program contains a function with the header int function(double d, char c). Which of the following function headers could be used within the same program”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

ambiguous is the correct answer to “When the compiler cannot differentiate between two overloaded constructors, they are called”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

True is the correct answer to “Some Streams work with input, and some with output”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

constructor is the correct answer to “If you design a class that needs special initialization tasks, you will want to design a(n) _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

denial is the correct answer to “Which type of statement does not occur in computer programs”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

control string is the correct answer to “The newline character is always included between”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

inheritance is the correct answer to “To be called object-oriented, a programming language must allow”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

type void is the correct answer to “A function that returns no values to the program that calls it is _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

struct is the correct answer to “The keyword used to define a structure is _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

type-specific is the correct answer to “If container classes are carefully constructed, then these tools are available to work with structures that are not ______”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

.H is the correct answer to “Header files often have the file extension _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

a class has been defined is the correct answer to “The #ifndef directive tests to see whether ________”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

can be T is the correct answer to “The generic type in a template function”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

class of the object using the function name is the correct answer to “When a child class function is called, the compiler looks first for a matching function name in the _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

destructor is the correct answer to “A function that is called automatically each time an object is destroyed is a”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

you must precede each function call with the word int or double is the correct answer to “If you create an instantiation of a class template with an int, and then create a second instantiation with a double, then”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

the generic class name is the correct answer to “The type to be used in an instantiation of a class template follows ________”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

cin >> currentPay is the correct answer to “Which of the following statements allows the user to enter data at the keyboard”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

by value is the correct answer to “When you pass a variable _____, C++ passes only the contents of the variable to the receiving function”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

loose is the correct answer to “The best form of coupling is _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

abstraction is the correct answer to “Paying attention to the important properties while ignoring inessential details is known as________”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

a null character is the correct answer to “What does C++ append to the end of a string literal constant”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

memory address is the correct answer to “An array name is a _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

// is the correct answer to “To enter a comment in a C++ program, you begin the comment with _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

"7.15 pm" is the correct answer to “Which of the following is(are) invalid string constant(s)”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

you save many lines of code by not rewriting an identical structure definition in each function that uses it is the correct answer to “You define a structure type globally because _____”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.

None of the above is the correct answer to “Overloaded functions are required to”. This question is standard in competitive examination syllabi for Object Oriented Programming Using C Plus Plus.