C++ Strings and Characters

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Questions and Answers

What is a string in C++?

A built-in data type in C++
An integer value stored in a string
A sequence of characters in quotes (correct)
A single character stored in a variable

What is the difference between a string variable and an array of characters?

A string variable is a built-in type, while an array of characters is a user-defined type
A string variable is a single character, while an array of characters is a sequence of characters
A string variable is initialized with double quotes, while an array of characters is initialized with single quotes
A string variable is a variable that stores a sequence of characters, while an array of characters is a variable that stores a single character (correct)

What is the size of the memory allocated for a string variable?

The size of the string variable is fixed, regardless of the number of characters in the string
The size of the string variable is equal to the number of characters in the string plus one (correct)
The size of the string variable is equal to the number of characters in the string
The size of the string variable is determined at runtime

What is the purpose of the #include directive in relation to strings?

To include the string library in the program (D) Signup and view all the answers

What is the difference between a string and an integer?

A string is a sequence of characters, while an integer is a numerical value (B) Signup and view all the answers

How many bytes are allocated for a string variable 'X6' with the value 'JADARA'?

6 bytes (D) Signup and view all the answers

What is the output of the code 'cout << s1;' if 's1' is a string variable with the value 'AAAAA AA'?

AAAAA AA (C) Signup and view all the answers

What is the purpose of the 'cout' statement in relation to strings?

To output a string to the console (A) Signup and view all the answers

What is the difference between a string and an empty string?

A string is a sequence of characters, while an empty string is a sequence of characters with a length of 0 (A) Signup and view all the answers

What is the purpose of the #include directive in relation to the C++ programming language?

To include the C++ standard library in the program (C) Signup and view all the answers

Study Notes

Data Types and Declarations

A string is a set of characters, represented as a sequence of letters in quotes.
Examples of strings: "JADARA", "C++ is fun!", " " (empty string).
A string variable stores a sequence of characters, and its size is variable.
In contrast, a char variable stores a single character, and its size is 1 byte.

Declaration and Initialization of Strings

The string type is not a built-in type in C++, so it requires the #include directive to use all its functions.
A string can be initialized using the string keyword, e.g., string X6 = "JADARA";.
A string can also be initialized as an array of characters, e.g., char s1[]= "AAAAA AA";.

Key Differences between string and char arrays

A string variable is declared using the string keyword, while a char array is declared using the char keyword.
A string variable can be initialized with a string literal, while a char array must be initialized with a character array.
A string variable can be manipulated using string functions, while a char array must be manipulated using array operations.

Output

The COUT statement is used to output strings and other variables to the console.

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Description

Learn about strings and characters in C++ programming, including declaration and initialization of strings and the differences between string and char variables.