Match the List-I with List II and select the correct answer using the codes given below :List I 'C' FunctionList II Include File(a) a cos (d)(i) time.h(b) abs (i)(ii) stdio.h(c) fprint (f, ..........)(iii) math.h(d) time (p)(iv) stdlib.h

The correct matching is a-iii, b-iv, c-ii, d-i.acos(d), the inverse cosine, is declared in math.h (iii).abs(i), the integer absolute value, is declared in stdlib.h (iv).fprintf(f, ...), printed as fprint, writes formatted output to a file stream and is in stdio.h (ii).time(p) is declared in time.h (i).A common slip is to look for abs in math.h, which holds fabs for floating-point values; the integer abs lives in stdlib.h, which rules out the codes giving it math.h.

Library Functions Questions and Answers

Q: What will be the output of the following C code? int main () { printf("starting of program\n"); printf("program exits\n"); exit(0); printf("program ends\n"); return(0); }

Correct answer: starting of program program exitsexit(0) terminates the program immediately, so the third printf and the return are never reached. Only the first two lines appear. Unlike return from main, exit can be called from anywhere and ends the whole program.

Q: What will be the output of the following C code? void main() { div_t res; res = div(34, 4); printf("quotient part = %d\n", res.quot); printf("remainder part = %d\n", res.rem); }

Correct answer: quotient part=8 remainder part=2div(34, 4) returns a div_t structure holding both results at once: quotient 8 and remainder 2, since \(34 = 8 \times 4 + 2\). Computing both together is cheaper than a separate / and %, and the sign behaviour is guaranteed to truncate toward zero.

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

Correct answer: 1If srand is never called, rand behaves as though srand(1) had been - the initial seed is 1. That is why an unseeded program produces the same sequence every time it runs.

Q: Which statement is true with respect to RAND_MAX?

Correct answer: specifies maximum value returned by rand()RAND_MAX is the largest value rand() can return, guaranteed to be at least 32767. It is needed to scale the result - rand() / (RAND_MAX + 1.0) gives a fraction between 0 and 1. srand returns nothing at all.

Match the List-I with List II and select the correct answer using the codes given below :

List I 'C' Function	List II Include File
(a) a cos (d)	(i) time.h
(b) abs (i)	(ii) stdio.h
(c) fprint (f, ..........)	(iii) math.h
(d) time (p)	(iv) stdlib.h

A.a-i, b-ii, c-iii, d-iv
B.a-iii, b-iv, c-ii, d-i
C.a-iv, b-iii, c-ii, d-i
D.a-ii, b-iii, c-iv, d-i

Exam Year(s)

MH SET - 2018, SET Exam - 2018,

Answer: B

The correct matching is a-iii, b-iv, c-ii, d-i.

acos(d), the inverse cosine, is declared in math.h (iii).
abs(i), the integer absolute value, is declared in stdlib.h (iv).
fprintf(f, ...), printed as fprint, writes formatted output to a file stream and is in stdio.h (ii).
time(p) is declared in time.h (i).

A common slip is to look for abs in math.h, which holds fabs for floating-point values; the integer abs lives in stdlib.h, which rules out the codes giving it math.h.

Discuss in Forum

A Program contains the following declarations and initial assignments
int i = 8, j = 5;
double x = 0.005, y = -0.01;
char c='c', d='d';
Determine the value of the following expressions which involve the use of library functions:
abs(i-2*j) ; log(exp(x)) ; toupper(d)

A.2; 0.005; D
B.1; 0.005; D
C.2; 0.005; E
D.1; 0.005; e

Exam Year(s)

UGC NET - 2013,

Answer: A

The values are 2, 0.005 and D. With i = 8 and j = 5, abs(i - 2*j) = abs(8 - 10) = 2. The function log(exp(x)) returns x, so it is 0.005. The function toupper('d') returns the capital letter D.

\[ \text{abs}(8 - 10) = 2 \]

\[ \log(e^{0.005}) = 0.005 \]

\[ \text{toupper}(d) = \text{D} \]

The options giving 1 for the first value are wrong, because the difference is -2 and its absolute value is 2. The options with E or lower case e are wrong because toupper of d is D.

Discuss in Forum

'Stdio.h' header file contains functions related to

A.prototypes for the standard input/output library functions.
B.prototypes for the standard input and standard output functions.
C.prototypes for the functions that perform input from files.
D.prototypes for functions that perform input from strings in memory and outputs to strings in memory.

Exam Year(s)

UGC NET - 2014,

Answer: B

The header stdio.h contains the prototypes of the standard input and standard output functions, such as printf, scanf, getchar and putchar, together with related definitions. That is why a program that reads from the keyboard or writes to the screen includes it.

Options (C) and (D) name only a subset: functions that read from files, and functions that work with strings held in memory. Option (A) says nothing more than the header's own name, "standard input/output library", without naming the standard input and standard output functions that give the header its purpose, so the keyed option (B) is the one that states what the header covers.

Discuss in Forum

The function "isalnum( )" returns a non-zero value if the character is alphanumeric and zero otherwise. What is header file to be used in the main program ?

A.stdio.h
B.io.h
C.ctype.h
D.string.h

Exam Year(s)

UGC NET - 2014,

Answer: C

The header file is ctype.h. The function isalnum() is declared in ctype.h along with the other character-class functions such as isalpha(), isdigit() and toupper().

stdio.h holds input and output functions such as printf and scanf, string.h holds string functions such as strlen and strcpy, and io.h is a system-specific header for low-level file operations, not for character tests.

Discuss in Forum

What will the code display on compiling?

void funccall() 
{ 
   printf("this is funccall\n"); 
}  
void main () 
{   
    atexit(funccall); 
    printf("program starts\n");  
    printf("program ends\n");  
}

A.program startsthis is funccallprogram ends
B.this is funccallprogram startsprogram ends
C.program startsprogram endsthis is funccall
D.error

Answer: C

int atexit(void (*func)(void)) calls the specified function func when the program terminates. we can register termination function anywhere in the program, but it will be called at the time of the program termination.

Discuss in Forum

What will be the output of the following C code?

int main () 
{ 
   printf("starting of program\n"); 
   printf("program exits\n"); 
   exit(0);  
   printf("program ends\n");  
   return(0); 
}

A.starting of programprogram exitsprogram ends
B.starting of programprogram exits
C.starting of programprogram ends
D.error

Answer: B

Correct answer: starting of program program exits

exit(0) terminates the program immediately, so the third printf and the return are never reached. Only the first two lines appear. Unlike return from main, exit can be called from anywhere and ends the whole program.

Discuss in Forum

What will the following C code do on compilation?

void main () 
{
   char com[50];  
   strcpy( com, "dir" ); 
   system(com); 
}

A.error
B.lists down all the files and directories in the current directory under windows machine
C.terminates the calling process immediately
D.calls specified function and terminates it at the end of the program

Answer: B

int system(const char *command) function is used to pass the command name or the program name specified by command to the host environment to be executed by the command processor and returns after the command has been completed.

Discuss in Forum

What will be the output of the following C code?

void main() 
{ 
   div_t  res;  
   res = div(34, 4); 
   printf("quotient part = %d\n", res.quot); 
   printf("remainder part = %d\n", res.rem); 
}

A.quotient part=0remainder part=4
B.quotient part=8remainder part=2
C.quotient part=4remainder part=0
D.quotient part=2remainder part=8

Answer: B

Correct answer: quotient part=8 remainder part=2

div(34, 4) returns a div_t structure holding both results at once: quotient 8 and remainder 2, since \(34 = 8 \times 4 + 2\). Computing both together is cheaper than a separate / and %, and the sign behaviour is guaranteed to truncate toward zero.

Discuss in Forum

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

A.1
B.00
C.01

Answer: A

Correct answer: 1

If srand is never called, rand behaves as though srand(1) had been - the initial seed is 1. That is why an unseeded program produces the same sequence every time it runs.

Discuss in Forum

10.

Which statement is true with respect to RAND_MAX?

A.specifies value for status argument to exit indicating failure
B.specifies value for status argument to exit indicating success
C.specifies maximum value returned by rand()
D.specifies maximum value returned by srand()

Answer: C

Correct answer: specifies maximum value returned by rand()

RAND_MAX is the largest value rand() can return, guaranteed to be at least 32767. It is needed to scale the result - rand() / (RAND_MAX + 1.0) gives a fraction between 0 and 1. srand returns nothing at all.

Discuss in Forum

Loading…

Topics

Other Subjects

Tags: Library Functions Questions and Answers || Library Functions MCQ Questions and Answers || Library Functions GK Questions and Answers || Library Functions GK MCQ Questions || Library Functions Multiple Choice Questions and Answers || Library Functions GK || GK on Library Functions || C Programming Questions and Answers || C Programming MCQ Questions and Answers || C Programming GK Questions and Answers || GK on C Programming

Library Functions Questions and Answers

Topics

Other Subjects

About Us

Stay informed about all important Dates & Notifications