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- Question
What will be the output of the program?
#include<stdio.h> int main() { int x=4, y, z; y = --x; z = x--; printf("%d, %d, %d\n", x, y, z); return 0; }
Options- A. 4, 3, 3
- B. 4, 3, 2
- C. 3, 3, 2
- D. 2, 3, 3
- Correct Answer
- 2, 3, 3
ExplanationStep 1: int x=4, y, z; here variable x, y, z are declared as an integer type and variable x is initialized to 4.
Step 2: y = --x; becomes y = 3; because (--x) is pre-decrement operator.
Step 3: z = x--; becomes z = 3;. In the next step variable x becomes 2, because (x--) is post-decrement operator.
Step 4: printf("%d, %d, %d\n", x, y, z); Hence it prints "2, 3, 3".
More questions
- 1. 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
- 2. 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.- 3. 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.- 4. A structure can be nested inside another structure.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. 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
- 6. 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
- 7. 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.- 8. 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
- 9. 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.- 10. 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
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