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C++ Array Type

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Questions and Answers

What is the type of the expression A in the given code?

const char *

none of the other choices

char[]

std::string (correct)

What is the type of each element in the array A?

const char *

std::string (correct)

char[]

C-style string

Why is the option 'const char *' incorrect?

The elements of A are std::string objects, not C-style strings (correct)

It is a pointer to a constant character array

It is a pointer to a non-constant character array

It is not a pointer to a constant character array

What is the index of the element referred to by the expression A?

4 Signup and view all the answers

What is the purpose of the #include statement in the code?

To include the necessary library for the std::string type Signup and view all the answers

What is the significance of zero-based array indices in C++?

It makes the array indices start from 0 Signup and view all the answers

What is the main difference between the std::string type and the C-style string?

std::string is a class, while C-style string is a primitive type Signup and view all the answers

Why is the option 'char[]' incorrect?

The elements of A are std::string objects, not character arrays Signup and view all the answers

Study Notes

Declaring an Array of std::string

std::string A[] = {"what", "is", "the", "size", "of", "this", "array?"}; declares an array of std::string, where each element is of type std::string.

Understanding the Type of Expression A

The expression A refers to the fourth element of the array A (since array indices in C++ are zero-based).
Given the type of A is an array of std::string, the type of A is std::string.

Analysis of Options

const char*: refers to a pointer to a constant character array, which is not the case here since the elements of A are std::string objects, not C-style strings.
std::string: each element in the array A is of type std::string, and hence A is of type std::string.
char[]: suggests an array of characters, which is also not the case since the elements of A are std::string objects, not character arrays.
none of the other choices: this option is incorrect because we have already identified the correct choice as std::string.