C Programming Questions and Answers – Bit-fields – 1

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This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Bit-fields – 1”.

Pre-requisite for C Bit-fields MCQ set: Video Tutorial on C Bit-fields.

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1. What is the correct syntax to initialize bit-fields in an structure?
a)

    struct temp
    {
        unsigned int a : 1;
    }s;

b)

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    struct temp
    {
        unsigned int a = 1;
    }s;

c)

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    struct temp
    {
        unsigned float a : 1;
    }s;

d) None of the mentioned
View Answer

Answer: a
Explanation: None.
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2. Which of the following data types are accepted while declaring bit-fields?
a) char
b) float
c) double
d) none of the mentioned
View Answer

Answer: a
Explanation: None.
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3. Which of the following reduces the size of a structure?
a) union
b) bit-fields
c) malloc
d) none of the mentioned
View Answer

Answer: b
Explanation: None.

4. For what minimum value of x in a 32-bit Linux OS would make the size of s equal to 8 bytes?

  1.     struct temp
  2.     {
  3.         int a : 13;
  4.         int b : 8;
  5.         int c : x;
  6.     }s;

a) 4
b) 8
c) 12
d) 32
View Answer

Answer: c
Explanation: None.

5. Calculate the % of memory saved when bit-fields are used for the following C structure as compared to with-out use of bit-fields for the same structure? (Assuming size of int = 4)

  1.     struct temp
  2.     {
  3.         int a : 1;
  4.         int b : 2;
  5.         int c : 4;
  6.         int d : 4;
  7.     }s;

a) 25%
b) 33.3%
c) 50%
d) 75%
View Answer

Answer: d
Explanation: None.

6. In the following declaration of bit-fields, the constant-expression specifies __________

    struct-declarator:
    declarator
    type-specifier declarator opt : constant-expression

a) The width of the field in bits
b) Nothing
c) The width of the field in bytes
d) Error
View Answer

Answer: a
Explanation: None.

7. In the following declaration of bit-fields, the constant-expression must be __________

    struct-declarator:
    declarator
    type-specifier declarator opt : constant-expression

a) Any type
b) Nothing
c) Integer value
d) Nonnegative integer value
View Answer

Answer: d
Explanation: None.

8. Which of the following is not allowed?
a) Arrays of bit fields
b) Pointers to bit fields
c) Functions returning bit fields
d) None of the mentioned
View Answer

Answer: d
Explanation: None.

9. Bit fields can only be declared as part of a structure.
a) false
b) true
c) Nothing
d) Varies
View Answer

Answer: b
Explanation: None.

10. What is the order for the following C declarations?

    short a : 17;
    int long y : 33;

a) Legal, legal
b) Legal, illegal
c) Illegal, illegal
d) Illegal, legal
View Answer

Answer: c
Explanation: None.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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