Essentials of C and C++ Programming

What is the primary difference between C and C++?

• C uses classes; C++ does not support classes.

• C is a high-level language; C++ is low-level.

• C is used for system programming; C++ is only for web development.

• C is procedural; C++ supports object-oriented programming.

Explain the concept of pointers in C.

• Pointers automatically manage memory without programmer intervention.

• Pointers are used to store string literals directly.

• Pointers are variables that hold the memory address of another variable, enabling dynamic memory management and efficient data handling.

• Pointers can only point to integer variables.

What are the advantages of using C++ over C?

• C is better for object-oriented programming than C++.

• C++ has a simpler syntax than C.

• C does not support templates or function overloading.

• C++ supports object-oriented programming, function overloading, templates, and a richer standard library.

Define the term 'class' in C++.

• A class in C++ is a type of variable that only holds integers.

• A class in C++ is a built-in data type that cannot contain functions.

• A class in C++ is a collection of unrelated functions and variables.

• A class in C++ is a user-defined data type that encapsulates data and functions.

What is a constructor in C++?

• A constructor is used to delete objects in C++.

• A constructor is a special member function in C++ that initializes objects.

• A constructor is a function that returns a value.

• A constructor is a type of variable in C++.

How do you declare a variable in C?

• var num: int;

• declare int num;

• To declare a variable in C, use the syntax: type variable_name; e.g., int num;.

• int num = new;

What is the purpose of the 'main' function in C/C++?

• The 'main' function is responsible for compiling the program.

• The 'main' function handles memory allocation in C/C++.

• The 'main' function is used for defining global variables.

• The 'main' function is the entry point of a C/C++ program.

Explain the use of 'new' and 'delete' in C++.

• 'new' is used for creating functions, 'delete' is used for removing variables.

• 'new' initializes variables, 'delete' is for freeing up stack space.

• 'new' allocates memory, 'delete' deallocates memory in C++.

• 'new' is for declaring classes, 'delete' is for terminating programs.

What is a header file in C/C++?

• A header file is a type of executable file that runs programs.

• A header file is a file containing declarations for functions and variables, typically with a '.h' extension, used to share code between source files.

• A header file is a binary file used for storing images.

• A header file is a file that contains only comments and documentation.

Describe the concept of inheritance in C++.

• Inheritance is a method to combine multiple classes into one single class.

• Inheritance in C++ is a way to hide data from other classes.

• Inheritance in C++ is a mechanism where a new class derives properties and methods from an existing class, enabling code reuse and establishing a hierarchical relationship.

• Inheritance allows classes to be created without any relationship to existing classes.