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Variables and Data Types in C++ MCQ question and answer with solution | C++ Programimg MCQs

Learn Variables and Data Types in C++ MCQ Questions and answers with easy and logical explanations in C++ Programimg. Variables and Data Types in C++ MCQ question provides all type of technical mcq questions which is important for technical exams, campus exams and other entrance examination. Page-2 section-1

Each section contains 100 MCQs on Variables and Data Types in C plus plus .
11
What is the correct syntax to declare and initialize a variable 'age' of type 'int' with a value of 25 in C++?
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Answer & Solution
Answer: Option C
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12
What is the range of values for a 'short int' data type in C++?
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Answer: Option D
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13
What does the 'auto' keyword do in C++?
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Answer: Option A
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14
Which of the following is an example of a floating-point data type in C++?
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Answer: Option B
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15
What is the correct way to represent hexadecimal values in C++?
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Answer & Solution
Answer: Option D
Solution:
Computers use different number systems. Decimal (base-10) is what we use every day. Hexadecimal (base-16) is useful for representing colors, memory addresses, and other things.

In C++, we use a special prefix to tell the compiler that a number is in hexadecimal.

Option A is incorrect because suffixes (things added to the end) aren't used for this purpose in C++.

Option B is also wrong. A prefix means something that comes at the beginning.

Option C is close, but not quite right. It's a bit of an older style.

Option D, "Prefix with 0x", is the correct answer. The '0x' prefix tells the compiler that the following number is in hexadecimal. For example: 0x1A represents the hexadecimal number 1A, which is equivalent to 26 in decimal.

Therefore, the correct way to represent hexadecimal values in C++ is by prefixing them with 0x.
16
What is the correct data type for storing a single character in C++?
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Answer: Option C
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17
What will be the output of the following code: cout << sizeof(char); in C++?
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Answer: Option B
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18
Which of the following is a valid way to initialize a variable in C++?
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Answer: Option C
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19
What is the maximum value that can be stored in an 'unsigned int' data type in C++?
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Answer: Option D
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20
Which of the following is the correct way to declare a constant 'PI' with a value of 3.14159 in C++?
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Answer: Option D
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