109 + Mcqs in Library Functions McqOptions

1.	Select the macro that affects the information provided by localeconv function.
A.	LC_ALL
B.	LC_COLLATE
C.	LC_NUMERIC
D.	LC_CTYPE
Answer» D. LC_CTYPE

Discussion

2.	What is returned by the function localeconv()?
A.	current location value
B.	past location value
C.	pointer to the last location
D.	pointer to the current location
Answer» E.

Discussion

3.	sqrt(x) function is not faster than the apparent equivalent pow(x,0.5).
A.	true
B.	false
Answer» C.

Discussion

4.	The macro which is used to find the maximum value of an unsigned integer is _________
A.	UNINT_MAX
B.	UNSINT_MAX
C.	UINT_MAX
D.	UNIT_MAX
Answer» D. UNIT_MAX

Discussion

5.	What error occurs if an input argument is outside the domain over which the mathematical function is deﬁned?
A.	domain error
B.	range error
C.	no error
D.	domain and range error
Answer» B. range error

Discussion

6.	Which of the following macros is defined under the header limits.h?
A.	FLT_ROUNDS
B.	USHRT_MAX
C.	DBL_MAX
D.	DECIMAL_DIG
Answer» C. DBL_MAX

Discussion

7.	mblen() function returns 0,if a null wide character was recognized. It returns -1 if an invalid multi-byte sequence was encountered.
A.	true
B.	false
Answer» B. false

Discussion

8.	The macro definition of INT_MIN is ____________
A.	-INT_MAX – 1
B.	INT_MAX – 1
C.	-INT_MAX + 1
D.	INT_MAX + 1
Answer» B. INT_MAX – 1

Discussion

9.	A type whose alignment requirement is at least as large as that of every data type:
A.	max_align_t
B.	ptrdiff_t
C.	size_t
D.	nULL
Answer» E.

Discussion

10.	Which function is used to recombine the fraction and exponent parts of a floating-point value after you have worked on them separately?
A.	frexp()
B.	exp()
C.	modf()
D.	Idexp()
Answer» E.

Discussion

11.	Which of the following functions returns a pointer to a string representing the date and time stored in a structure?
A.	ctime()
B.	time()
C.	asctime()
D.	localtime()
Answer» D. localtime()

Discussion

12.	Which macro can be used to detect and report exceptional conditions?
A.	extern
B.	edom
C.	assert
D.	lbdl_min 1e-37
Answer» D. lbdl_min 1e-37

Discussion

13.	Which of the following library functions returns the time in UTC (Greenwich mean time) format?
A.	localtime()
B.	gettime()
C.	gmtime()
D.	settime()
Answer» D. settime()

Discussion

14.	Which of the following header declares mathematical functions and macros?
A.	math.h
B.	assert.h
C.	stdmat. h
D.	stdio. h
Answer» B. assert.h

Discussion

15.	The macro offset expands to a constant of type __________________
A.	size_t
B.	print_t
C.	ptrdiff_t
D.	nULL
Answer» B. print_t

Discussion

16.	double______(double x, double y) computes the floating-point remainder of x/y.
A.	modf
B.	fmod
C.	ceil
D.	floor
Answer» C. ceil

Discussion

17.	What are the contents of the register?
A.	sp, fp only
B.	sp only
C.	fp, pc only
D.	sp, fp, pc
Answer» E.

Discussion

18.	When we use multiple alignas specifiers in the same declaration, the ____________ one is used.
A.	first
B.	strictest
C.	last
D.	middle
Answer» C. last

Discussion

19.	Initial seed is ________ for the function srand(unsigned int seed).
A.	0
B.	1
C.	0
D.	1
Answer» C. 0

Discussion

20.	Which header file should be included if a function has to be defined such that it can accept variable number of arguments?
A.	stdlib.h
B.	stdarg.h
C.	assert.h
D.	setjmp.h
Answer» C. assert.h

Discussion

21.	A domain error occurs if x is negative and y is not an integral value for the function pow(double x, double y).
A.	true
B.	false
Answer» B. false

Discussion

22.	Which of the following format specifiers is used to represent the hours in the 24 hour clock (0-23) format?
A.	%I
B.	%H
C.	%i
D.	%h
Answer» C. %i

Discussion

23.	The value returned by the library function mktime(), on failure is:
A.	-1
B.	0
C.	1
D.	-2
Answer» B. 0

Discussion

24.	To find the maximum value of an object of type unsigned long long int, we use the macro _________
A.	ULINT_MAX
B.	ULLINT_MAX
C.	ULONG_MAX
D.	ULLONG_MAX
Answer» E.

Discussion

25.	Which of the given function is a library function under the header math.h?
A.	log10()
B.	log20()
C.	log30()
D.	log50()
Answer» B. log20()

Discussion

26.	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

Discussion

27.	Which function returns the arc sine in the range [-pi/2, +pi/2] radians?
A.	arcsin()
B.	asin()
C.	sin()
D.	asine()
Answer» C. sin()

Discussion

28.	The mbstowcs() function is used to return the number of array elements modified, not including a terminating zero code, if any.
A.	true
B.	false
Answer» B. false

Discussion

29.	MB_CUR_MAX is not defined in stdlib.h.
A.	true
B.	false
Answer» C.

Discussion

30.	The header file assert.h of the C Standard Library defines ________macro.
A.	stderr
B.	stdarg
C.	setjmp
D.	assert
Answer» E.

Discussion

31.	The purpose of the function ctime() is that ___________
A.	it returns a string representing the local time
B.	it returns a void string
C.	it returns a string representing the time in UTC format
D.	it returns a string representing the time stored in a structure
Answer» B. it returns a void string

Discussion

32.	The library function clock() returns the number of _________ elapsed since the start of the program.
A.	minutes
B.	clock ticks
C.	milli-seconds
D.	micro-seconds
Answer» C. milli-seconds

Discussion

33.	The pointer used in the mblen() function points to the _________
A.	first byte of multibyte character
B.	last byte of multibyte character
C.	middle byte of multibyte character
D.	no pointer is used in mblen function
Answer» B. last byte of multibyte character

Discussion

34.	What will function gcvt() do?
A.	Convert vector to integer value
B.	Convert floating-point number to a string
C.	Convert 2D array in to 1D array.
D.	Covert multi Dimensional array to 1D array
Answer» C. Convert 2D array in to 1D array.

Discussion

35.	What will be the output of the program? #include int main() { int i; char c; for(i=1; i
A.	aaaa
B.	aaaaa
C.	Garbage value.
D.	Error in ungetc statement.
Answer» C. Garbage value.

Discussion

36.	If the two strings are found to be unequal then strcmp returns difference between the first non-matching pair of characters.
A.	1
B.
Answer» B.

Discussion

37.	What will be the output of the program? #include #include int main() { char *i = "55.555"; int result1 = 10; float result2 = 11.111; result1 = result1+atoi(i); result2 = result2+atof(i); printf("%d, %f", result1, result2); return 0; }
A.	55, 55.555
B.	66, 66.666600
C.	65, 66.666000
D.	55, 55
Answer» D. 55, 55

Discussion

38.	FILE is a structure suitably typedef'd in "stdio.h".
A.	1
B.
Answer» B.

Discussion

39.	Will the program outputs "IndiaBIX.com"? #include #include int main() { char str1[] = "IndiaBIX.com"; char str2[20]; strncpy(str2, str1, 8); printf("%s", str2); return 0; }
A.	Yes
B.	No
Answer» C.

Discussion

40.	Can you use the fprintf() to display the output on the screen?
A.	Yes
B.	No
Answer» B. No

Discussion

41.	ftell() returns the current position of the pointer in a file stream.
A.	1
B.
Answer» B.

Discussion

42.	Point out the error in the following program. #include int main() { char str[] = "IndiaBIX"; printf("%.#s %2s", str, str); return 0; }
A.	Error: in Array declaration
B.	Error: printf statement
C.	Error: unspecified character in printf
D.	No error
Answer» E.

Discussion

43.	What will be the output of the program? #include #include int main() { char dest[] = {97, 97, 0}; char src[] = "aaa"; int i; if((i = memcmp(dest, src, 2))==0) printf("Got it"); else printf("Missed"); return 0; }
A.	Missed
B.	Got it
C.	Error in memcmp statement
D.	None of above
Answer» C. Error in memcmp statement

Discussion

44.	The prototypes of all standard library string functions are declared in the file string.h.
A.	Yes
B.	No
Answer» B. No

Discussion

45.	What will be the output of the program? #include #include int main() { float i = 2.5; printf("%f, %d", floor(i), ceil(i)); return 0; }
A.	2, 3
B.	2.000000, 3
C.	2.000000, 0
D.	2, 0
Answer» D. 2, 0

Discussion

46.	Data written into a file using fwrite() can be read back using fscanf()
A.	1
B.
Answer» C.

Discussion

47.	Point out the error in the following program. #include #include int main() { char str1[] = "Learn through IndiaBIX\0.com", str2[120]; char p; p = (char) memccpy(str2, str1, 'i', strlen(str1)); *p = '\0'; printf("%s", str2); return 0; }
A.	Error: in memccpy statement
B.	Error: invalid pointer conversion
C.	Error: invalid variable declaration
D.	No error and prints "Learn through Indi"
Answer» E.

Discussion

48.	What will be the output of the program? #include int main() { int i; i = scanf("%d %d", &i, &i); printf("%d\n", i); return 0; }
A.	1
B.	2
C.	Garbage value
D.	Error: cannot assign scanf to variable
Answer» C. Garbage value

Discussion

49.	What will be the output of the program? #include int main() { int i; char c; for(i=1; i
A.	bbbb
B.	bbbbb
C.	b
D.	Error in ungetc statement.
Answer» D. Error in ungetc statement.

Discussion

50.	scanf() or atoi() function can be used to convert a string like "436" in to integer.
A.	Yes
B.	No
Answer» B. No

Discussion

Explore topic-wise MCQs in Testing Subject.

Select the macro that affects the information provided by localeconv function.

What is returned by the function localeconv()?

sqrt(x) function is not faster than the apparent equivalent pow(x,0.5).

The macro which is used to find the maximum value of an unsigned integer is _________

What error occurs if an input argument is outside the domain over which the mathematical function is deﬁned?

Which of the following macros is defined under the header limits.h?

mblen() function returns 0,if a null wide character was recognized. It returns -1 if an invalid multi-byte sequence was encountered.

The macro definition of INT_MIN is ____________

A type whose alignment requirement is at least as large as that of every data type:

Which function is used to recombine the fraction and exponent parts of a floating-point value after you have worked on them separately?

Which of the following functions returns a pointer to a string representing the date and time stored in a structure?

Which macro can be used to detect and report exceptional conditions?

Which of the following library functions returns the time in UTC (Greenwich mean time) format?

Which of the following header declares mathematical functions and macros?

The macro offset expands to a constant of type __________________

double______(double x, double y) computes the floating-point remainder of x/y.

What are the contents of the register?

When we use multiple alignas specifiers in the same declaration, the ____________ one is used.

Initial seed is ________ for the function srand(unsigned int seed).

Which header file should be included if a function has to be defined such that it can accept variable number of arguments?

A domain error occurs if x is negative and y is not an integral value for the function pow(double x, double y).

Which of the following format specifiers is used to represent the hours in the 24 hour clock (0-23) format?

The value returned by the library function mktime(), on failure is:

To find the maximum value of an object of type unsigned long long int, we use the macro _________

Which of the given function is a library function under the header math.h?

The header file setjmp.h is used to

Which function returns the arc sine in the range [-pi/2, +pi/2] radians?

The mbstowcs() function is used to return the number of array elements modified, not including a terminating zero code, if any.

MB_CUR_MAX is not defined in stdlib.h.

The header file assert.h of the C Standard Library defines ________macro.

The purpose of the function ctime() is that ___________

The library function clock() returns the number of _________ elapsed since the start of the program.

The pointer used in the mblen() function points to the _________

What will function gcvt() do?

What will be the output of the program? #include int main() { int i; char c; for(i=1; i

If the two strings are found to be unequal then strcmp returns difference between the first non-matching pair of characters.

What will be the output of the program? #include #include int main() { char *i = "55.555"; int result1 = 10; float result2 = 11.111; result1 = result1+atoi(i); result2 = result2+atof(i); printf("%d, %f", result1, result2); return 0; }

FILE is a structure suitably typedef'd in "stdio.h".

Will the program outputs "IndiaBIX.com"? #include #include int main() { char str1[] = "IndiaBIX.com"; char str2[20]; strncpy(str2, str1, 8); printf("%s", str2); return 0; }

Can you use the fprintf() to display the output on the screen?

ftell() returns the current position of the pointer in a file stream.

Point out the error in the following program. #include int main() { char str[] = "IndiaBIX"; printf("%.#s %2s", str, str); return 0; }

What will be the output of the program? #include #include int main() { char dest[] = {97, 97, 0}; char src[] = "aaa"; int i; if((i = memcmp(dest, src, 2))==0) printf("Got it"); else printf("Missed"); return 0; }

The prototypes of all standard library string functions are declared in the file string.h.

What will be the output of the program? #include #include int main() { float i = 2.5; printf("%f, %d", floor(i), ceil(i)); return 0; }

Data written into a file using fwrite() can be read back using fscanf()

Point out the error in the following program. #include #include int main() { char str1[] = "Learn through IndiaBIX\0.com", str2[120]; char *p; p = (char*) memccpy(str2, str1, 'i', strlen(str1)); *p = '\0'; printf("%s", str2); return 0; }

What will be the output of the program? #include int main() { int i; i = scanf("%d %d", &i, &i); printf("%d\n", i); return 0; }

What will be the output of the program? #include int main() { int i; char c; for(i=1; i

scanf() or atoi() function can be used to convert a string like "436" in to integer.

Point out the error in the following program. #include #include int main() { char str1[] = "Learn through IndiaBIX\0.com", str2[120]; char p; p = (char) memccpy(str2, str1, 'i', strlen(str1)); *p = '\0'; printf("%s", str2); return 0; }