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- Question
Bit fields CANNOT be used in union.
Options- A. True
- B. False
- Correct Answer
- False
ExplanationThe following is the example program to explain "using bit fields inside an union".#include<stdio.h> union Point { unsigned int x:4; unsigned int y:4; int res; }; int main() { union Point pt; pt.x = 2; pt.y = 3; pt.res = pt.y; printf("\n The value of res = %d" , pt.res); return 0; } // Output: The value of res = 3
Structures, Unions, Enums problems
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- 1. A union cannot be nested in a structure
Options- A. True
- B. False Discuss
Correct Answer: False
- 2. The '.' operator can be used access structure elements using a structure variable.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. Which of the following statement is True?
Options- A. User has to explicitly define the numeric value of enumerations
- B. User has a control over the size of enumeration variables.
- C. Enumeration can have an effect local to the block, if desired
- D. Enumerations have a global effect throughout the file. Discuss
Correct Answer: Enumeration can have an effect local to the block, if desired
- 4. The '->' operator can be used to access structures elements using a pointer to a structure variable only
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. Union elements can be of different sizes.
Options- A. True
- B. False Discuss
Correct Answer: True
- 6. one of elements of a structure can be a pointer to the same structure.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. A structure can contain similar or dissimilar elements
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. It is not possible to create an array of pointer to structures.
Options- A. True
- B. False Discuss
Correct Answer: False
- 9. If a char is 1 byte wide, an integer is 2 bytes wide and a long integer is 4 bytes wide then will the following structure always occupy 7 bytes?
struct ex { char ch; int i; long int a; };
Options- A. Yes
- B. No Discuss
Correct Answer: No
Explanation:
A compiler may leave holes in structures by padding the first char in the structure with another byte just to ensures that the integer that follows is stored at an location. Also, there might be 2extra bytes after the integer to ensure that the long integer is stored at an address, which is multiple of 4. Such alignment is done by machines to improve the efficiency of accessing values.- 10. Can we have an array of bit fields?
Options- A. Yes
- B. No Discuss
Correct Answer: No
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