C Declarations and Initializations Questions with Answers

Understanding C Declarations and Initializations is fundamental for mastering C programming. These concepts are frequently covered in programming questions and answers for placement tests and technical interviews at companies like TCS, Infosys, and Wipro. Declarations define variables, while initializations assign values to them, both ensuring efficient memory and data handling in C. This guide provides C programming MCQs and practical examples that clarify variable scope, storage classes, and initialization rules. Ideal for both beginners and job seekers, it strengthens your coding logic and interview readiness with real-world examples and practice problems.

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Which of the following statements should be used to obtain a remainder after dividing 3.14 by 2.1 ?

A rem = 3.14 % 2.1;
B rem = modf(3.14, 2.1);
C rem = fmod(3.14, 2.1);
D Remainder cannot be obtain in floating point division.

Answer: Option C

What are the types of linkages?

A Internal and External
B External, Internal and None
C External and None
D Internal

Answer: Option B

Which of the following special symbol allowed in a variable name?

A * (asterisk)
B | (pipeline)
C - (hyphen)
D _ (underscore)

Answer: Option D

Is there any difference between following declarations? 1 :     extern int fun(); 2 :     int fun();

A Both are identical
B No difference, except extern int fun(); is probably in another file
C int fun(); is overrided with extern int fun();
D None of these

Answer: Option B

How would you round off a value from 1.66 to 2.0?

A ceil(1.66)
B floor(1.66)
C roundup(1.66)
D roundto(1.66)

Answer: Option A

By default a real number is treated as a

A float
B double
C long double
D far double

Answer: Option B

Is the following statement a declaration or definition? extern int i;

A Declaration
B Definition
C Function
D Error

Answer: Option A

Identify which of the following are declarations extern int x; float square ( float x ) { ... } double pow(double, double);

A 1
B 2
C 1 and 3
D 3

Answer: Option C

When we mention the prototype of a function?

A Defining
B Declaring
C Prototyping
D Calling

Answer: Option B

Q10

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

A int 2var;
B int _var;
C int var-iable;
D int @var;

Answer: Option B

Explanation: Valid variable names cannot start with numbers or contain special characters except underscore.

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