String Variable Declarations and Initialization Quiz

Test your knowledge on string variable declaration, initialization, and manipulation in programming languages like Java, C++, Python, JavaScript, and C#.

Practice Learn Test

Which of the following is the correct way to declare a string variable in Java?

string myString;

String myString;

string = myString;

String = myString;

1 answered

What does the 'new' keyword do when initializing a string variable in Java?

Creates a new instance of the String class

Allocates memory for the string

Converts the string to uppercase

Deletes the existing string

Which of the following is a correct way to concatenate strings in Python?

str_concat(string1, string2)

string1.concat(string2)

string1 + string2

concat(string1, string2)

In JavaScript, which method is used to find the length of a string?

size()

length()

size

length

Which of the following is NOT a valid way to declare a string variable in C++?

string myString;

String myString;

char myString[50];

std::string myString;

In Python, what will the expression 'len('hello')' return?

hello

Which of the following characters is used to represent the end of a string in C programming?

What does the 'trim()' method do in Java when applied to a string?

Trims leading and trailing whitespaces

Converts the string to uppercase

Splits the string into substrings

Concatenates two strings

Which of the following is a valid way to declare a string variable in JavaScript?

string myString = 'Hello';

String myString = 'Hello';

var myString = 'Hello';

let myString = 'Hello';

#10

What method is used to convert a string to lowercase in JavaScript?

toLower()

toLowerCase()

lowerCase()

caseLower()

#11

In C++, what is the result of the following code: string myString = "Hello" + "World";

myString contains "Hello World"

Compilation error

myString contains "Hello" followed by garbage value

myString contains garbage value

#12

Which method is used to compare two string objects in Java?

compare()

compareTo()

equals()

equal()

#13

What is the output of the following C# code: string str = "hello"; Console.WriteLine(str[0]);

hello

Compilation error

#14

Which of the following methods is used to convert a string to uppercase in Python?

toUpper()

upper()

toUpperCase()

caseUpper()

#15

Which of the following methods is used to check if a string contains a specific substring in JavaScript?

includes()

contains()

hasSubstring()

indexOf()

#16

What is the output of the following C# code: string str = "hello"; Console.WriteLine(str.ToUpper());

hello

HELLO

Hello

hElLo

#17

Which operator is used for string concatenation in PHP?

#18

What is the output of the following Python code: print('hello'.index('l'))?

#19

In Python, which method is used to split a string into a list of substrings based on a delimiter?

split()

separate()

divide()

cut()

#20

What will the expression 'str1 + str2' do in C++ if str1 and str2 are string variables?

Concatenates str1 and str2

Throws a compilation error

Compares str1 and str2

Converts str1 to uppercase

#21

What is the difference between String and StringBuilder in Java?

String is immutable whereas StringBuilder is mutable

String is mutable whereas StringBuilder is immutable

Both String and StringBuilder are immutable

Both String and StringBuilder are mutable

#22

In Java, what is the purpose of the 'intern()' method in the String class?

To convert the string to lowercase

To concatenate strings

To remove leading and trailing whitespaces

To store a common string pool

#23

In Java, which method is used to convert an int to a string?

String.valueOf()

toString()

convertToString()

String.toString()

#24

In C++, what function is used to find the length of a string?

strlen()

length()

size()

len()

#25

Which method is used to find the last index of a substring within a string in Java?

indexOfLast()

lastIndexOf()

findLastIndex()

searchLast()

String Variable Declarations and Initialization Quiz

Which of the following is the correct way to declare a string variable in Java?

What does the 'new' keyword do when initializing a string variable in Java?

Which of the following is a correct way to concatenate strings in Python?

In JavaScript, which method is used to find the length of a string?

Which of the following is NOT a valid way to declare a string variable in C++?

In Python, what will the expression 'len('hello')' return?

Which of the following characters is used to represent the end of a string in C programming?

What does the 'trim()' method do in Java when applied to a string?

Which of the following is a valid way to declare a string variable in JavaScript?

What method is used to convert a string to lowercase in JavaScript?

In C++, what is the result of the following code: string myString = "Hello" + "World";

Which method is used to compare two string objects in Java?

What is the output of the following C# code: string str = "hello"; Console.WriteLine(str[0]);

Which of the following methods is used to convert a string to uppercase in Python?

Which of the following methods is used to check if a string contains a specific substring in JavaScript?

What is the output of the following C# code: string str = "hello"; Console.WriteLine(str.ToUpper());

Which operator is used for string concatenation in PHP?

What is the output of the following Python code: print('hello'.index('l'))?

In Python, which method is used to split a string into a list of substrings based on a delimiter?

What will the expression 'str1 + str2' do in C++ if str1 and str2 are string variables?

What is the difference between String and StringBuilder in Java?

In Java, what is the purpose of the 'intern()' method in the String class?

In Java, which method is used to convert an int to a string?

In C++, what function is used to find the length of a string?

Which method is used to find the last index of a substring within a string in Java?

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