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- Question
The macro va_start is used to initialise a pointer to the beginning of the list of fixed arguments.
Options- A. True
- B. False
- Correct Answer
- False
- 1. A union cannot be nested in a structure
Options- A. True
- B. False Discuss
- 2. The binary equivalent of 5.375 is
Options- A. 101.101110111
- B. 101.011
- C. 101011
- D. None of above Discuss
- 3. Which of the following is the correct order if calling functions in the below code?
a = f1(23, 14) * f2(12/4) + f3();
Options- A. f1, f2, f3
- B. f3, f2, f1
- C. Order may vary from compiler to compiler
- D. None of above Discuss
- 4. If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?
Options- A. .
- B. &
- C. *
- D. -> Discuss
- 5. Assuming a integer 2-bytes, What will be the output of the program?
#include<stdio.h> int main() { printf("%x\n", -1<<3); return 0; }
Options- A. ffff
- B. fff8
- C. 0
- D. -1 Discuss
- 6. A float is 4 bytes wide, whereas a double is 8 bytes wide.
Options- A. True
- B. False Discuss
- 7. What will be the output of the program?
#include<stdio.h> #include<string.h> int main() { printf("%c\n", "abcdefgh"[4]); return 0; }
Options- A. Error
- B. d
- C. e
- D. abcdefgh Discuss
- 8. What is the output of the program?
#include<stdio.h> int main() { union a { int i; char ch[2]; }; union a u; u.ch[0] = 3; u.ch[1] = 2; printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i); return 0; }
Options- A. 3, 2, 515
- B. 515, 2, 3
- C. 3, 2, 5
- D. None of these Discuss
- 9. What will be the output of the program?
#include<stdio.h> int main() { int X=40; { int X=20; printf("%d ", X); } printf("%d\n", X); return 0; }
Options- A. 40 40
- B. 20 40
- C. 20
- D. Error Discuss
- 10. What will be the output of the program?
#include<stdio.h> int main() { char c=48; int i, mask=01; for(i=1; i<=5; i++) { printf("%c", c|mask); mask = mask<<1; } return 0; }
Options- A. 12400
- B. 12480
- C. 12500
- D. 12556 Discuss
More questions
Correct Answer: False
Correct Answer: 101.011
Correct Answer: Order may vary from compiler to compiler
Explanation:
Here, Multiplication will happen before the addition, but in which order the functions would be called is undefined. In an arithmetic expression the parenthesis tell the compiler which operands go with which operators but do not force the compiler to evaluate everything within the parenthesis first.
Correct Answer: ->
Correct Answer: fff8
Explanation:
The system will treat negative numbers in 2's complement method.
Example:
Assume the size of int is 2-bytes(16 bits). The integer value 1 is represented as given below:
Binary of 1: 00000000 00000001 (this is for positive value of 1)
1's complement of binary 1: 11111111 11111110
2's complement of binary 1: 11111111 11111111
Thy system will store '11111111 11111111' in memory to represent '-1'.
If we do left shift (3 bits) on 11111111 11111111 it will become as given below:
11111111 11111111 ---(left shift 3 times)---> 11111111 11111000.
So, 11111111 11111000 ---(binary to hex)---> FF F8. (Required Answer)
Note:
How is the negative number obtained from 2's complement value?
As stated above, -1 is represented as '11111111 11111111' in memory.
So, the system will take 2's complement of '11111111 11111111' to the get the original negative value back.
Example:
Bit Representation of -1: 11111111 11111111
Since the left most bit is 1, it is a negative number. Then the value is
1's complement: 00000000 00000000
2's complement: 00000000 00000001 (Add 1 to the above result)
Therefore, '00000000 00000001' = 1 and the sign is negative.
Hence the value is -1.
Example:
Assume the size of int is 2-bytes(16 bits). The integer value 1 is represented as given below:
Binary of 1: 00000000 00000001 (this is for positive value of 1)
1's complement of binary 1: 11111111 11111110
2's complement of binary 1: 11111111 11111111
Thy system will store '11111111 11111111' in memory to represent '-1'.
If we do left shift (3 bits) on 11111111 11111111 it will become as given below:
11111111 11111111 ---(left shift 3 times)---> 11111111 11111000.
So, 11111111 11111000 ---(binary to hex)---> FF F8. (Required Answer)
Note:
How is the negative number obtained from 2's complement value?
As stated above, -1 is represented as '11111111 11111111' in memory.
So, the system will take 2's complement of '11111111 11111111' to the get the original negative value back.
Example:
Bit Representation of -1: 11111111 11111111
Since the left most bit is 1, it is a negative number. Then the value is
1's complement: 00000000 00000000
2's complement: 00000000 00000001 (Add 1 to the above result)
Therefore, '00000000 00000001' = 1 and the sign is negative.
Hence the value is -1.
Correct Answer: True
Explanation:
True,
float = 4 bytes.
double = 8 bytes.
float = 4 bytes.
double = 8 bytes.
Correct Answer: e
Explanation:
printf("%c\n", "abcdefgh"[4]); It prints the 5 character of the string "abcdefgh".
Hence the output is 'e'.
Correct Answer: 3, 2, 515
Explanation:
printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i); It prints the value of u.ch[0] = 3, u.ch[1] = 2 and it prints the value of u.i means the value of entire union size.
So the output is 3, 2, 515.
Correct Answer: 20 40
Explanation:
In case of a conflict between a local variable and global variable, the local variable gets priority.
Correct Answer: 12480
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