String Operations 1 Quiz Online Practice Test

Test Name:	String Operations 1 Quiz
Subject Category:	C Programming
Test Type:	Multiple Choice Questions
Total Score / Questions:	20 / 20
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.

String Operations 1 MCQ Quiz Online Practice Test

1. In the `<string.h>` header, two distinct groups of string functions are defined. What are these groups?

The first group consists of functions starting with `str`, and the second group with `mem`.

The first group consists of functions starting with `str`, and the second group with `is`.

The first group consists of functions starting with `string`, and the second group with `mem`.

The first group consists of functions starting with `str`, and the second group with `type`.

2. What is the purpose of the function `char *strchr(ch, c)`?

Returns a pointer to the first occurrence of `ch` in `c`, or NULL if not found.

Returns a pointer to the first occurrence of `c` in `ch`, or NULL if not found.

Returns a pointer to the first occurrence of `ch` in `c`, or ignores if not found.

Returns a pointer to the first occurrence of `c` in `ch`, or ignores if not found.

3. Which of the following functions returns a pointer to the last occurrence of `c` in `ch`, or NULL if it is not found?

char *strchr(ch, c)

char *strrchr(ch, c)

char *strncat(ch, c)

char *strcat(ch, c)

4. Which of the following functions compares at most `n` characters of the string `ch` to the string `s`?

int strncmp(ch, s, n)

int strcmp(ch, s)

int strncmp(s, ch, n)

int strcmp(s, ch)

5. Which of the following options correctly explains the function `size_t strcspn(c, s)`?

Returns the length of the prefix of `s` that consists of characters not found in `c`.

Returns the length of the prefix of `s` that consists of characters present in `c`.

Returns the length of the prefix of `c` that consists of characters not found in `s`.

Returns the length of the prefix of `c` that consists of characters present in `s`.

6. The `mem` functions are designed for _______.

Returning a pointer to the token

Manipulating objects as character arrays

Returning a pointer to implementation-defined strings

Returning a pointer to the first occurrence of one string in another string

7. What does the function `void *memset(s, c, n)` accomplish?

Places character `s` into the first `n` characters of `c`, returning `c`.

Places character `c` into the first `n` characters of `s`, returning `s`.

Places character `s` into the first `n` characters of `c`, returning `s`.

Places character `c` into the first `n` characters of `s`, returning `c`.

8. Functions that start with "strn" are designed to:

Manipulate sequences of arbitrary characters

Manipulate null-terminated sequences of characters

Manipulate sequences of non-null characters

Return a pointer to the token

9. Which of the following represents the correct syntax for copying `n` characters from the object pointed to by `s2` to the object pointed to by `s1`?

void *memcpy(void *s1, const void *s2, size_t n);

void *memcpy(void *s2, const void *s1, size_t n);

void memcpy(void *s1, const void *s2, size_t n);

void memcpy(void *s2, const void *s1, size_t n);

10. What is the return value of the function `void *memmove(void *s1, const void *s2, size_t n);`?

Returns the value of `s1`

Returns the value of `s2`

Does not return any value

Returns the combined values of `s1` and `s2`

11. Which of the following functions is specifically designed for copying data?

memcpy()

strcopy()

memcopy()

strxcpy()

12. Which function would you use to concatenate two strings?

strcpy()

strcat()

strncon()

memcon()

13. The ______ function is designed to append up to n characters to a string.

strcat()

strcon()

strncat()

memcat()

14. What is the purpose of the `strcmp()` function?

Compares the first n characters of two objects

Compares two strings

Undefined function

Copies a string

15. What is the correct prototype for the `strcoll()` function?

int strcoll(const char *s1, const char *s2)

int strcoll(const char *s1)

int strcoll(const *s1, const *s2)

int strcoll(const *s1)

16. What is the purpose of the `strcoll()` function?

Compares two strings, with the result depending on the LC_COLLATE setting

Copies a string, with the result depending on the LC_COLLATE setting

Compares two strings, with the result not influenced by the LC_COLLATE setting

Copies a string, with the result not influenced by the LC_COLLATE setting

17. Which of the following represents a variable type defined in the `<string.h>` header?

sizet

size

size_t

size-t

18. NULL is a macro defined in the `<string.h>` header.

True

False

Only in C

Only in C++

19. What will the following C code output?
const char pla[] = "string1";
const char src[] = "string2";
printf("Before memmove: pla = %s, src = %s\n", pla, src);
memmove(pla, src, 7);
printf("After memmove: pla = %s, src = %s\n", pla, src);

Before memmove: pla = string1, src = string2. After memmove: pla = string2, src = string2.

Before memmove: pla = string2, src = string2. After memmove: pla = string1, src = string2.

Before memmove: pla = string2, src = string1. After memmove: pla = string2, src = string2.

Before memmove: pla = string1, src = string2. After memmove: pla = string1, src = string1.

20. What will the following C code produce as output?
const char str1[] = "ABCDEF1234567";
const char str2[] = "269";
len = strcspn(str1, str2);
printf("First matching character is at %d\n", len + 1);

First matching character is at 8

First matching character is at 7

First matching character is at 9

First matching character is at 12