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- Question
What will be the output of the program?
#include<stdio.h> #include<string.h> int main() { char str1[5], str2[5]; int i; gets(str1); gets(str2); i = strcmp(str1, str2); printf("%d\n", i); return 0; }
Options- A. Unpredictable integer value
- B. 0
- C. -1
- D. Error
- Correct Answer
- Unpredictable integer value
Explanationgets() gets collects a string of characters terminated by a new line from the standard input stream stdin.The gets(str1) read the input string from user and store in variable str1.
The gets(str2) read the input string from user and store in variable str2.
The code i = strcmp(str1, str2); The strcmp not only returns -1, 0 and +1, but also other negative or positive values. So the value of i is "unpredictable integer value".
printf("%d\n", i); It prints the value of variable i.
More questions
- 1. Is it necessary that in a function which accepts variable argument list there should be at least be one fixed argument?
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 2. Bitwise can be used to generate a random number.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 3. A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.
Options- A. True
- B. False Discuss
Correct Answer: False
- 4. Bitwise & can be used to check if more than one bit in a number is on.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
False, the preprocessor cannot trap the errors, it only replaces the macro with the given expression. But the compiler will detect errors.- 6. It is necessary that a header files should have a .h extension?
Options- A. Yes
- B. No Discuss
Correct Answer: No
Explanation:
No, the header files have any kind of extension.- 7. Bitwise | can be used to set multiple bits in number.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 8. Bitwise & can be used to check if a bit in number is set or not.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. A pointer union CANNOT be created
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 10. What will be the output of the program?
#include<stdio.h> #include<stdlib.h> int main() { union test { int i; float f; char c; }; union test *t; t = (union test *)malloc(sizeof(union test)); t->f = 10.10f; printf("%f", t->f); return 0; }
Options- A. 10
- B. Garbage value
- C. 10.100000
- D. Error Discuss
Correct Answer: 10.100000
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