MCQOPTIONS
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MCQOPTIONS
This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your C knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
setjmp takes a jmp_buf type and different other type variables as input. |
| A. | true |
| B. | false |
| Answer» C. | |
| 2. |
What are the contents of the register? |
| A. | sp, fp only |
| B. | sp only |
| C. | fp, pc only |
| D. | sp, fp, pc |
| Answer» E. | |
| 3. |
What will the following C statement do? |
| A. | save the current state of the registers into env |
| B. | resets the registers to the values saved in env |
| C. | provides a definition for env structure |
| D. | accept variable(env) argument lists to be writtenView Answer |
| Answer» B. resets the registers to the values saved in env | |
| 4. |
A less common use of setjmp.h is to create syntax similar to ____________ |
| A. | errno |
| B. | variable arguments |
| C. | coroutines |
| D. | retval |
| Answer» D. retval | |
| 5. |
The void longjmp( jmp-buf env, int val) function causes setjmp() macro to return _______ value; if val is 0. |
| A. | zero |
| B. | one |
| C. | null |
| D. | no return |
| Answer» C. null | |
| 6. |
The header file setjmp.h is used to __________ |
| A. | set location specific information |
| B. | control low-level calls and returns to and from functions |
| C. | handle signals reported during a program’s execution |
| D. | manipulate strings (character arrays) |
| Answer» C. handle signals reported during a program’s execution | |
| 7. |
WHAT_ARE_THE_CONTENTS_OF_THE_REGISTER??$ |
| A. | sp, fp only |
| B. | sp only |
| C. | fp, pc only |
| D. | sp, fp, pc |
| Answer» C. fp, pc only | |
| 8. |
CHOOSE_THE_RIGHT_DECLARATION_OF_LONGJMP()_FUNCTION.?$ |
| A. | void longjmp(jmp_buf environment, int value) |
| B. | void longjmp(setjmp environment, int value) |
| C. | void longjmp(int value, jmp_buf environment) |
| D. | void longjmp(int value, setjmp environment) |
| Answer» B. void longjmp(setjmp environment, int value) | |
| 9. |
Which function restores the environment saved by the most recent invocation of the setjmp() macro in the same invocation of the program? |
| A. | jmp_buf |
| B. | longjmp |
| C. | jmpbuf |
| D. | long_jmp |
| Answer» C. jmpbuf | |
| 10. |
longjmp() function is the only function defined under the header file setjmp.h? |
| A. | true |
| B. | false |
| Answer» B. false | |
| 11. |
A less common use of setjmp.h is to create syntax similar to |
| A. | errno |
| B. | variable arguments |
| C. | coroutines |
| D. | retval |
| Answer» D. retval | |
| 12. |
How many times can the macro setjmp() return? |
| A. | one time |
| B. | two times |
| C. | three times |
| D. | many times |
| Answer» C. three times | |
| 13. |
How many times does the function longjmp() returns? |
| A. | once |
| B. | twice |
| C. | thrice |
| D. | never |
| Answer» E. | |
| 14. |
Select the correct declaration of setjmp(). |
| A. | int setjmp(jmp_buf environment) |
| B. | int setjmp(long_jmp environment) |
| C. | int setjmp(jmp_buf ) |
| D. | int setjmp(long_jmp) |
| Answer» B. int setjmp(long_jmp environment) | |
| 15. |
What is the function of the given longjump(jmp_buf buf, i)? |
| A. | go back to place buf is pointing to and return i |
| B. | go back to place buf is pointing to and return 0 |
| C. | uses buf to remember current position and returns 0 |
| D. | uses buf to remember current position and returns i |
| Answer» B. go back to place buf is pointing to and return 0 | |
| 16. |
A non-zero value is returned, if setjmp() returns from a longjmp() function call. |
| A. | false |
| B. | true |
| Answer» C. | |
| 17. |
Which of the given statement is not true with respect to void longjmp( jmp-buf env, int val)? |
| A. | The variable value cannot be zero |
| B. | env is the object containing information to restore the environment at the jmp_buf’s calling point |
| C. | This function does not return any value |
| D. | This function restores the environment saved by the most recent call to setjmp() macro |
| Answer» C. This function does not return any value | |
| 18. |
If setjmp() macro returns directly from the macro invocation, it______ |
| A. | returns zero |
| B. | returns non-zero |
| C. | produces error |
| D. | nothing can be said |
| Answer» B. returns non-zero | |
| 19. |
Which is the true statement with respect to the function longjmp()? |
| A. | the function where setjmp() was called has terminated, then the results are undefined |
| B. | the function where setjmp() was called has terminated, then the results are defined |
| C. | the function where jmp_buf was called has terminated, then the results are undefined |
| D. | the function where jmp_buf was called has terminated, then the results are defined |
| Answer» B. the function where setjmp() was called has terminated, then the results are defined | |
| 20. |
Which macro saves the current environment into the variable environment for later use by the function longjmp(). |
| A. | setjmp |
| B. | longjmp |
| C. | jmp |
| D. | set_jmp |
| Answer» B. longjmp | |
| 21. |
The void longjmp( jmp-buf env, int val) function causes setjmp() macro to return_______value; if val is 0. |
| A. | zero |
| B. | one |
| C. | NULL |
| D. | no return |
| Answer» C. NULL | |
| 22. |
Which of the given options is an array type used for holding information? |
| A. | longjmp |
| B. | setjmp |
| C. | jmp_buf |
| D. | no such variable |
| Answer» D. no such variable | |
| 23. |
Which of the following header file defines one function longjmp(), and one variable type jmp_buf? |
| A. | stdarg.h |
| B. | locale.h |
| C. | setjmp.h |
| D. | stdlib.h |
| Answer» D. stdlib.h | |