Standard Library Functions MCQs

Question 1

Which of the given statement is true with respect to the function atexit()?

Accepted Answer

The atexit() function is used to return zero if the registration succeeds, nonzero if it fails

Answer

The atexit() function cannot return to its caller

Answer

The atexit() function returns no value

Answer

The atexit() function causes abnormal program termination to occur

Question 2

What will be the output of the following C code? #include #include #include void -Assert (char *mesg) { fputs (mesg, stderr); fputs (" -- assertion failed " , stderr); abort () ; }

Accepted Answer

prints assertion message and aborts

Answer

prints only assertion message

Answer

program is just aborted

Answer

no action takes place

Question 3

Which is the true statement with respect to the function longjmp()?

Accepted Answer

the function where setjmp() was called has terminated, then the results are undefined

Answer

the function where setjmp() was called has terminated, then the results are defined

Answer

the function where jmp_buf was called has terminated, then the results are undefined

Answer

the function where jmp_buf was called has terminated, then the results are defined

Question 4

Which among the given header file is used to handle different signals reported during program execution?

Accepted Answer

signal.h

Answer

stdarg.h

Answer

assert.h

Answer

setjmp.h

Question 5

Which of the given function is used for searching?

Accepted Answer

bsearch()

Answer

lsearch()

Answer

csearch()

Answer

qsearch()

Question 6

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

Accepted Answer

clock ticks

Answer

minutes

Answer

milli-seconds

Answer

micro-seconds

Question 7

Which of the given C function can be used instead of the apparent identity pointed to by y? int x=1; double y= 0.5 * (exp (x) + exp (-x));

Accepted Answer

cosh(x)

Answer

cos(x)

Answer

fmod(x)

Answer

modf(x)

Question 8

Select the right statement with reference to malloc() and calloc().

Accepted Answer

malloc() does not set the memory to zero whereas calloc() sets allocated memory to zero

Answer

malloc() sets the memory to zero whereas calloc() does not set allocated memory to zero

Answer

malloc() sets the memory to zero whereas calloc() sets allocated memory to zero

Answer

malloc() does not set the memory to zero whereas calloc() does not set allocated memory to zero

Question 9

Which is the correct declaration of macro assert?

Accepted Answer

void assert(int expression);

Answer

void assert(float expression);

Answer

void assert(double expression);

Answer

void assert( expression);