Variables and Constants in C Sharp MCQ question and answer with solution

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What is the correct way to declare a floating-point variable in C#?

A) var num; B) Num float; C) double num; D) float num;

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Answer & Solution

Answer: Option D

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Which of the following is a valid constant name in C#?

A) MAX_VALUE B) my-constant C) 123constant D) _CONSTANT

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Answer & Solution

Answer: Option A

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What is the value of a variable after it is declared but not initialized in C#?

A) Depends on the data type B) 0 C) null D) undefined

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Answer & Solution

Answer: Option B

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In C#, how do you declare a variable without initializing it?

A) num = int; B) num int; C) var num; D) int num;

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Answer & Solution

Answer: Option D

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What is the data type of the following variable declaration: var x = 10;

A) dynamic B) var C) int D) object

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Answer & Solution

Answer: Option C

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Which of the following is a valid variable declaration in C#?

A) num = int; B) int num; C) int = num; D) None of the above

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Answer & Solution

Answer: Option B

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What is the correct way to declare a constant string in C#?

A) const MESSAGE = "Hello"; B) MESSAGE const = "Hello"; C) const string MESSAGE = "Hello"; D) string MESSAGE = "Hello";

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Answer & Solution

Answer: Option C

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What is the data type of the variable in C#?

A) int B) string C) double D) char

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Answer & Solution

Answer: Option B

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Which keyword is used to define a constant in C#?

A) static B) readonly C) final D) const

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Answer & Solution

Answer: Option D

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What does the 'readonly' keyword do in C#?

A) Makes a variable accessible outside its class B) Makes a variable constant C) Makes a variable read-only D) Makes a variable static

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Answer & Solution

Answer: Option C

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Variables and Constants in C Sharp MCQ question and answer with solution | C# Program MCQs