Standard Library Functions MCQs

Question 1

Which of the given statement is not true with respect to void longjmp( jmp-buf env, int val)?

Accepted Answer

env is the object containing information to restore the environment at the jmp_buf's calling point

Answer

The variable value cannot be zero

Answer

This function does not return any value

Answer

This function restores the environment saved by the most recent call to setjmp() macro

Question 2

void free(void *p) performs which of the following functions?

Accepted Answer

de-allocates space to which p points

Answer

returns pointer to allocated space for existing contents of p

Answer

to abnormally terminate the program

Answer

no such function defined in stdlib.h

Question 3

atol(const char *str) Converts the string pointed to, by the argument str.

Accepted Answer

to a long integer

Answer

to a integer

Answer

to a floating point number

Answer

to a unsigned long integer

Question 4

How many macros are defined in the header file stdarg.h?

Accepted Answer

three

Answer

one

Answer

two

Answer

four

Question 5

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

Accepted Answer

first byte of multibyte character

Answer

last byte of multibyte character

Answer

middle byte of multibyte character

Answer

no pointer is used in mblen function

Question 6

What is the role of the given C function? void va_end(va_list ap)

Accepted Answer

allows a function with variable arguments which used the va_start macro to return

Answer

retrieves the next argument in the parameter list

Answer

initializes ap variable to be used with the va_arg and va_start macros

Answer

returns the next additional argument as an expression

Question 7

The . . . . . . . . macro shall be invoked before any access to the unnamed arguments.

Accepted Answer

va_start

Answer

va_arg

Answer

va_end

Answer

va_list

Question 8

Correct code to turn assertions OFF at various places throughout a source file is . . . . . . . .

Accepted Answer

#define NDEBUG #include

Answer

#undef NDEBUG #include

Answer

#define DEBUG #include

Answer

#undef N-DEBUG #include

Question 9

Which among the given function does not return a value?

Accepted Answer

srand()

Answer

strtoul()

Answer

strtol()

Answer

rand()