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- Question
Assuming, integer is 2 byte, What will be the output of the program?
#include
; int main() { printf("%x\n", -1>>1); return 0; }
Options- A. ffff
- B. 0fff
- C. 0000
- D. fff0
- Correct Answer
- ffff
ExplanationNegative numbers are treated with 2's complement method.
1's complement: Inverting the bits ( all 1s to 0s and all 0s to 1s)
2's complement: Adding 1 to the result of 1's complement.
Binary of 1(2byte) : 0000 0000 0000 0001 Representing -1: 1s complement of 1(2byte) : 1111 1111 1111 1110 Adding 1 to 1's comp. result : 1111 1111 1111 1111 Right shift 1bit(-1>>1): 1111 1111 1111 1111 (carry out 1) Hexadecimal : f f f f (Filled with 1s in the left side in the above step)
Note:1. Fill with 1s in the left side for right shift for negative numbers.
2. Fill with 0s in the right side for left shift for negative numbers.
3. Fill with 0s in the left side for right shift for positive numbers.
4. Fill with 0s in the right side for left shift for positive numbers.
More questions
- 1. What are the types of linkages?
Options- A. Internal and External
- B. External, Internal and None
- C. External and None
- D. Internal Discuss
Correct Answer: External, Internal and None
Explanation:
External Linkage-> means global, non-static variables and functions.
Internal Linkage-> means static variables and functions with file scope.
None Linkage-> means Local variables.- 2. Out of fgets() and gets() which function is safe to use?
Options- A. gets()
- B. fgets() Discuss
Correct Answer: fgets()
Explanation:
Because, In fgets() we can specify the size of the buffer into which the string supplied will be stored.- 3. A structure can be nested inside another structure.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. What will be the output of the program (sample.c) given below if it is executed from the command line?
cmd> sample one two three/* sample.c */ #include<stdio.h> int main(int argc, char *argv[]) { int i=0; i+=strlen(argv[1]); while(i>0) { printf("%c", argv[1][--i]); } return 0; }
Options- A. three two one
- B. owt
- C. eno
- D. eerht Discuss
Correct Answer: eno
- 5. 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
- 6. Point out the error in the program?
struct emp { int ecode; struct emp *e; };
Options- A. Error: in structure declaration
- B. Linker Error
- C. No Error
- D. None of above Discuss
Correct Answer: No Error
Explanation:
This type of declaration is called as self-referential structure. Here *e is pointer to a struct emp.- 7. Point out the error in the program?
#include<stdio.h> int main() { union a { int i; char ch[2]; }; union a z1 = {512}; union a z2 = {0, 2}; return 0; }
Options- A. Error: invalid union declaration
- B. Error: in Initializing z2
- C. No error
- D. None of above Discuss
Correct Answer: Error: in Initializing z2
- 8. Point out the error in the program?
struct emp { int ecode; struct emp e; };
Options- A. Error: in structure declaration
- B. Linker Error
- C. No Error
- D. None of above Discuss
Correct Answer: Error: in structure declaration
Explanation:
The structure emp contains a member e of the same type.(i.e) struct emp. At this stage compiler does not know the size of sttructure.- 9. What will be the output of the program (sample.c) given below if it is executed from the command line?
cmd> sample friday tuesday sunday/* sample.c */ #include<stdio.h> int main(int argc, char *argv[]) { printf("%c", **++argv); return 0; }
Options- A. s
- B. f
- C. sample
- D. friday Discuss
Correct Answer: f
- 10. What is the purpose of fflush() function.
Options- A. flushes all streams and specified streams.
- B. flushes only specified stream.
- C. flushes input/output buffer.
- D. flushes file buffer. Discuss
Correct Answer: flushes all streams and specified streams.
Explanation:
"fflush()" flush any buffered output associated with filename, which is either a file opened for writing or a shell command for redirecting output to a pipe or coprocess.
Example:
fflush(FilePointer);
fflush(NULL); flushes all streams.
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