250+ TOP MCQs on Bit-fields and Answers [2024]

C programming Objective Questions on “Bit-fields”. One shall practice these Objective Questions to improve their C programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C programming Objective Questions come with detailed explanation of the answers which helps in better understanding of C concepts.

Here is a listing of C programming Objective Questions on “Bit-fields” along with answers, explanations and/or solutions:

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

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

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

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

d) None of the mentioned
Answer: a
Clarification: None.

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

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

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

```
    struct temp
```
```
    {
```
```
        int a : 13;
```
```
        int b : 8;
```
```
        int c : x;
```
```
    }s;
```

a) 4
b) 8
c) 12
d) 32
Answer: c
Clarification: 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)

```
    struct temp
```
```
    {
```
```
        int a : 1;
```
```
        int b : 2;
```
```
        int c : 4;
```
```
        int d : 4;
```
```
    }s;
```

a) 25%
b) 33.3%
c) 50%
d) 75%
Answer: d
Clarification: 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
Answer: a
Clarification: 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
Answer: d
Clarification: 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
Answer: d
Clarification: None.

9. Bit fields can only be declared as part of a structure.
a) false
b) true
c) Nothing
d) Varies
Answer: b
Clarification: 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
Answer: c
Clarification: None.

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