Explore topic-wise MCQs in C Programming.

This section includes 109 Mcqs, each offering curated multiple-choice questions to sharpen your C Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the purpose of function.

A. flushes all streams and specified streams.
B. flushes only specified stream.
C. flushes input/output buffer.
D. flushes file buffer.
Answer» B. flushes only specified stream.
Discussion
2.

Can you use the to display the output on the screen?

A. Yes
B. No
Answer» B. No
Discussion
3.

What will the function do in Turbo C under DOS?

A. returns a random number.
B. returns a random number generator in the specified range.
C. returns a random number generator with a random value based on time.
D. return a random number with a given seed value.
Answer» D. return a random number with a given seed value.
Discussion
4.

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

A. True
B. False
Answer» B. False
Discussion
5.

returns the current position of the pointer in a file stream.

A. True
B. False
Answer» B. False
Discussion
6.

Data written into a file using can be read back using

A. True
B. False
Answer» C.
Discussion
7.

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

A. True
B. False
Answer» B. False
Discussion
8.

What will function 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
9.

Will the program outputs "IndiaBIX.com"?

A. Yes
B. No
Answer» C.
Discussion
10.

The function can convert an integer in decimal, octal or hexadecimal form to a string.

A. Yes
B. No
Answer» B. No
Discussion
11.

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

A. Yes
B. No
Answer» B. No
Discussion
12.

or function can be used to convert a string like "436" in to integer.

A. Yes
B. No
Answer» B. No
Discussion
13.

What will the function do?

A. Reposition the file pointer to a character reverse.
B. Reposition the file pointer stream to end of file.
C. Reposition the file pointer to begining of that line.
D. Reposition the file pointer to begining of file.
Answer» E.
Discussion
14.

What is ?

A. standard error
B. standard error types
C. standard error streams
D. standard error definitions
Answer» D. standard error definitions
Discussion
15.

Does there any function exist to convert the or to a ?

A. Yes
B. No
Answer» B. No
Discussion
16.

Point out the error in the following program._x000D_ #include_x000D_ #include_x000D_ _x000D_ int main()_x000D_ {_x000D_ char str1[] = "Learn through IndiaBIX\0.com", str2[120];_x000D_ char *p;_x000D_ p = (char*) memccpy(str2, str1, 'i', strlen(str1));_x000D_ *p = '\0';_x000D_ printf("%s", str2);_x000D_ return 0;_x000D_ }

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
17.

What will be the output of the program?_x000D_ #include_x000D_ #include_x000D_ _x000D_ int main()_x000D_ {_x000D_ char dest[] = {97, 97, 0};_x000D_ char src[] = "aaa";_x000D_ int i;_x000D_ if((i = memcmp(dest, src, 2))==0)_x000D_ printf("Got it");_x000D_ else_x000D_ printf("Missed");_x000D_ return 0;_x000D_ }

A. Missed
B. Got it
C. Error in memcmp statement
D. None of above
Answer» C. Error in memcmp statement
Discussion
18.

What will be the output of the program?_x000D_ #include_x000D_ #include_x000D_ _x000D_ int main()_x000D_ {_x000D_ char *i = "55.555";_x000D_ int result1 = 10;_x000D_ float result2 = 11.111;_x000D_ result1 = result1+atoi(i);_x000D_ result2 = result2+atof(i);_x000D_ printf("%d, %f", result1, result2);_x000D_ return 0;_x000D_ }

A. 55, 55.555
B. 66, 66.666600
C. 65, 66.666000
D. 55, 55
Answer» D. 55, 55
Discussion
19.

What will be the output of the program?_x000D_ #include_x000D_ #include_x000D_ _x000D_ int main()_x000D_ {_x000D_ float i = 2.5;_x000D_ printf("%f, %d", floor(i), ceil(i));_x000D_ return 0;_x000D_ }

A. 2, 3
B. 2.000000, 3
C. 2.000000, 0
D. 2, 0
Answer» D. 2, 0
Discussion
20.

What will be the output of the program?_x000D_ #include_x000D_ _x000D_ int main()_x000D_ {_x000D_ int i;_x000D_ i = printf("How r u\n");_x000D_ i = printf("%d\n", i);_x000D_ printf("%d\n", i);_x000D_ return 0;_x000D_ }

A. How r u72
B. How r u82
C. How r u11
D. Error: cannot assign printf to variable
Answer» C. How r u11
Discussion
21.

What will be the output of the program?_x000D_ #include_x000D_ _x000D_ int main()_x000D_ {_x000D_ int i;_x000D_ char c;_x000D_ for(i=1; i<=5; i++)_x000D_ {_x000D_ scanf("%c", &c); /* given input is 'a' */_x000D_ printf("%c", c);_x000D_ ungetc(c, stdin);_x000D_ }_x000D_ return 0;_x000D_ }

A. aaaa
B. aaaaa
C. Garbage value.
D. Error in ungetc statement.
Answer» C. Garbage value.
Discussion
22.

When using atoi( ) with an apstring variable,

A. all numbers within the string will be converted to integers.
B. you must convert the apstring to a standard string by using .c_str( ).
C. all alphabetic characters within the string will be counte
D. all characters within the string will be converted to ASCII equivalents.
Answer» C. all alphabetic characters within the string will be counte
Discussion
23.

time_t is

A. a data type
B. a variable used to hold a number from the computer's internal clock.
C. a header file.
D. a built-in library function which will return a value from the internal clock.
Answer» B. a variable used to hold a number from the computer's internal clock.
Discussion
24.

The built-in library function ceil(x) requires the header file

A. 1)
B. 2)
C. 3)
D. 4)
Answer» B. 2)
Discussion
25.

void (*signal(int sig, void (*func)(int)))(int);If the value of func is SIG_IGN then _________

A. the signal will be ignored
B. default handling for that signal will occur
C. The signal() function will fail to execute
D. the signal will be ignored
Answer» B. default handling for that signal will occur
Discussion
26.

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

A. returns pointer to allocated space for existing contents of p
B. de-allocates space to which p points
C. to abnormally terminate the program
D. no such function defined in stdlib.h
Answer» C. to abnormally terminate the program
Discussion
27.

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

A. #undef NDEBUG #include
B. #define NDEBUG #include
C. #define NDEBUG #include
D. #undef NDEBUG #include
Answer» B. #define NDEBUG #include
Discussion
28.

The C library function _____________function converts the wide character to its multibyte representation.

A. mblen()
B. mbtowc()
C. wcstombs()
D. wctomb()
Answer» E.
Discussion
29.

The calloc() function allocates space for an array of n objects, each of whose size is defined by size. Space is initialized to all bits zero.

A. true
B. false
Answer» B. false
Discussion
30.

Which of the given option is declared under the header file stdlib.h?

A. SEEK_CUR
B. SEEK_END
C. CLOCKS_PER_SEC
D. EXIT_SUCCESS
Answer» E.
Discussion
31.

void free(void *ptr) deallocates the memory previously allocated by a call to _______ ________ or _________

A. malloc,getenv,abort
B. calloc,malloc,exit
C. calloc,malloc,realloc
D. exit,getenv,abort
Answer» D. exit,getenv,abort
Discussion
32.

The value of tm_isdst is ____ when DST( Daylight Savings Time) is in effect, ______ when DST is not in effect and ______ when the DST status is unknown.

A. -1, 1, 0
B. 1, 0, -1
C. 0, 1, -1
D. 1, -1, 0
Answer» C. 0, 1, -1
Discussion
33.

Which function converts the wide-character string to a multibyte string?

A. wcstombs()
B. mbstowcs()
C. mbtowc()
D. mblen()
Answer» B. mbstowcs()
Discussion
34.

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» D. specifies maximum value returned by srand()
Discussion
35.

The following message is displayed in stderr.Assertion failed: expression, file filenum, line nmn

A. true
B. false
Answer» B. false
Discussion
36.

The minimum value of CHAR_BIT is equal to ________

A. 2
B. 4
C. 8
D. 16
Answer» D. 16
Discussion
37.

Which among the given function does not return a value?

A. strtoul()
B. strtol()
C. rand()
D. srand()
Answer» E.
Discussion
38.

Which function is called by macro assert to terminate the execution?

A. exit()
B. atexit()
C. abort()
D. no function called
Answer» D. no function called
Discussion
39.

Which of the following format specifiers is used to represent the name of the time zone?

A. %A
B. %B
C. %H
D. %Z
Answer» E.
Discussion
40.

The ldexp() function multiplies a floating-point number by an integral power of 2.

A. true
B. false
Answer» B. false
Discussion
41.

What is the name of the function that is used to convert multibyte character to wide character?

A. mblen()
B. mbtowc()
C. mbstowcs()
D. wcstombs()
Answer» C. mbstowcs()
Discussion
42.

The maximum value of a signed char is not the same as the maximum value of an unsigned char.

A. True
B. False
Answer» B. False
Discussion
43.

setjmp takes a jmp_buf type and different other type variables as input.

A. true
B. false
Answer» C.
Discussion
44.

Select the multibyte character function defined under the header file stdlib.h.

A. wctomb()
B. mblen()
C. mbtowc()
D. all of the mentioned
Answer» E.
Discussion
45.

Which function returns a pseudo-random integer?

A. srand()
B. rand()
C. malloc()
D. alloc()
Answer» C. malloc()
Discussion
46.

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)
Discussion
47.

The macros defined under the header file limits.h are not defined under any other header file.

A. False
B. True
Answer» C.
Discussion
48.

The number of bytes contained in the multibyte character pointed to by a character is ___________

A. getenv()
B. bsearch()
C. mblen()
D. qsort()
Answer» D. qsort()
Discussion
49.

In the c library function void (*signal(int sig, void (*func)(int)))(int), which statement is true with respect to func?

A. func is a pointer to the function
B. func is pointer to sig
C. func is a static variable
D. func is a pointer that points to all type of data
Answer» B. func is pointer to sig
Discussion
50.

Which of the given function differs from the statement'errno is not neccessarily set on conversion error'?

A. atof()
B. atoi()
C. atol()
D. strtod()
Answer» E.
Discussion