C++ Structures and Pointers Quiz

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Questions and Answers

What is a characteristic of structures in C++?

  • Structures cannot contain functions.
  • All data members are private by default.
  • Structures can only hold variables of one data type.
  • All data members are public by default. (correct)

In what context are structure pointers particularly useful?

  • For serializing data to files.
  • For passing structures to functions. (correct)
  • For accessing global variables.
  • For creating static arrays.

Which operator is used to access data members of a structure through a pointer?

  • ::
  • &
  • -> (correct)
  • .

What can a structure in C++ contain?

<p>An instance of another structure. (D)</p> Signup and view all the answers

What must be done if dynamic memory is used for any of the members of a structure?

<p>It must be freed before the program exits. (B)</p> Signup and view all the answers

What type of structures can be declared in C++?

<p>Both global and local structures. (D)</p> Signup and view all the answers

Which of the following is NOT a feature of nested structures?

<p>Nested structures must contain at least one member variable. (A)</p> Signup and view all the answers

What happens if you forget to free dynamic memory used in a structure's members?

<p>It causes a memory leak. (B)</p> Signup and view all the answers

What is the return value of the functions like find_last_of() if no matches are found?

<p>string::npos (C)</p> Signup and view all the answers

Which function is used to erase a part of a string and reduce its length?

<p>erase() (B)</p> Signup and view all the answers

What should ideally be used when passing a string during a function call to avoid unnecessary copies?

<p>Pass by reference (A)</p> Signup and view all the answers

What is the function 'begin()' used for in relation to STL containers?

<p>To return the beginning position of the container (B)</p> Signup and view all the answers

How many overloads does the insert() member function have based on the C++ version?

<p>More than six (B)</p> Signup and view all the answers

What is a primary advantage of using std::string over C-style strings?

<p>std::string does not require null termination. (C)</p> Signup and view all the answers

Which member function can be used to add a character to the end of a std::string?

<p>push_back() (C)</p> Signup and view all the answers

What happens if you attempt to access an out-of-bounds index in a std::string using the at(i) function?

<p>It throws an exception. (B)</p> Signup and view all the answers

What does the find() member function of std::string return if the specified sequence is not found?

<p>std::string::npos. (A)</p> Signup and view all the answers

How is memory allocated for the characters in std::string managed?

<p>It is handled automatically by the std::string class. (A)</p> Signup and view all the answers

Which std::string function would you use to retrieve the last character of a string without removing it?

<p>back() (A)</p> Signup and view all the answers

Which character does a C-style string require at the end to define its termination?

<p>'\0' (D)</p> Signup and view all the answers

What is the function of find_first_of() in std::string?

<p>To search for the first character that matches any specified characters. (D)</p> Signup and view all the answers

Flashcards

Structures in C++

A user-defined type that groups related variables of different data types into a single unit.

Array of Structures

An array where each element is a structure. Useful for storing collections of related data.

Structure Pointers

Pointers that hold addresses of structures. Used for passing structures to functions and dynamic allocation.

Nested Structures

A structure containing another structure. Used when organizing data in hierarchical manner.

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Structure Functions

Functions declared inside a structure. Accessed through instances only.

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Structure Declaration

Declaring a structure defines a new data type.

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Structure Member Access

Accessing individual members within a structure using the dot operator (.).

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Structure Member Alignment

Memory arrangement of structure members. Crucial for performance and correctness in certain situations.

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std::string

A C++ class for storing and manipulating sequences of characters (strings).

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C-style string

An array of characters terminated by a null character ('\0').

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getline()

Reads a line of text from an input stream into a string.

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push_back()

Adds a character to the end of a string.

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pop_back()

Removes the last character from a string.

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find()

Searches for a substring within a string.

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find_first_of()

Searches for the first character matching any character from a given set.

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std::string member functions

Built-in methods for manipulating string objects like copying, searching, insertion, and deletion.

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std::string insert()

Adds characters to a string at a specific position.

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std::string erase()

Removes part of a string, reducing its length.

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std::string substr()

Extracts a portion of a string.

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String Iterators

Used to point to string elements, efficient manipulation.

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std::string find()

Searches for a substring in a string.

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Related Documents

Lecture 10 - Structs.pdf

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