Mastering C++ Concepts

What is the purpose of file handling in C++?

• To create graphical user interfaces.

• To manage memory allocation in C++.

• The purpose of file handling in C++ is to enable reading from and writing to files for data persistence.

• To improve the speed of program execution.

Explain the difference between ifstream and ofstream in C++.

• ifstream is for writing to files, while ofstream is for reading from files.

• ifstream is for reading from files, while ofstream is for writing to files.

• Both ifstream and ofstream are used for reading files only.

• ifstream and ofstream are the same and can be used interchangeably.

How do you open a file for reading in C++?

• std::ifstream file = new ifstream("filename.txt");

• std::ifstream file.open("filename.txt");

• std::ifstream file;

• std::ifstream file("filename.txt");

What is operator overloading in C++?

• Operator overloading is a method to increase the speed of C++ programs.

• Operator overloading is a feature that allows the use of C++ keywords as variable names.

• Operator overloading is a way to create new operators in C++.

• Operator overloading is a feature in C++ that allows operators to be redefined and used with user-defined types.

Provide an example of overloading the '+' operator for a class.

• class Vector: def __init__(self, x, y): self.x = x self.y = y def __add__(self, other): return Vector(self.x + other.x, self.y + other.y) v1 = Vector(1, 2) v2 = Vector(3, 4) v3 = v1 + v2 # v3 is now Vector(4, 6)

• class Vector: def __init__(self, x): self.x = x def __add__(self, other): return self.x + other

• class Vector: def __init__(self, x, y): self.x = x self.y = y def add(self, other): return Vector(self.x + other.x, self.y + other.y)

• class Vector: def __init__(self, x, y): self.x = x self.y = y def __add__(self, other): return (self.x + other.x, self.y + other.y)

What are the advantages of using STL in C++?

• STL is not compatible with object-oriented programming.

• Advantages of using STL include code reusability, performance, flexibility, ease of use, and support for generic programming.

• STL increases the complexity of code without benefits.

• STL is only useful for small projects.

Name three types of STL containers and their uses.

• vector, list, map

• array, set, queue

• hashmap, tree, graph

• stack, deque, tuple

How do you insert an element into a vector in C++?

• vector.push_back(value); or vector.insert(position, value);

• vector.insert(value, position);

• vector.push(value);

• vector.add(value);

What is exception handling in C++?

• Exception handling in C++ is a method to optimize code performance.

• Exception handling in C++ uses 'try' and 'catch' only, without 'throw'.

• Exception handling in C++ is a mechanism to manage runtime errors using 'try', 'catch', and 'throw' keywords.

• Exception handling in C++ is only for compile-time errors.

Describe the try-catch block in C++.

• A try-catch block in C++ is a mechanism for handling exceptions, where 'try' contains code that may throw an exception and 'catch' handles the exception.

• A try-catch block in C++ is only used for debugging purposes.

• A try-catch block is used for defining functions in C++.

• The try-catch block is a way to optimize code performance.