Data Structures and Algorithms Multiple choice Questions and Answers-String Operations

1.	Which of the following function sets first n characters of a string to a given character?
a.	strinit()
b.	strnset()
c.	strset()
d.	strcset()

Discuss

Answer: (b).strnset()

2.	If the two strings are identical, then strcmp() function returns
a.	-1
b.	1
c.	0
d.	Yes

Discuss

Answer: (c).0

3.	How will you print \n on the screen?
a.	printf("\n");
b.	echo "\\n";
c.	printf('\n');
d.	printf("\\n");

Discuss

Answer: (d).printf("\\n");

4.	The library function used to find the last occurrence of a character in a string is
a.	strnstr()
b.	laststr()
c.	strrchr()
d.	strstr()

Discuss

Answer: (c).strrchr()

5.	Which of the following function is used to find the first occurrence of a given string in another string?
a.	strchr()
b.	strrchr()
c.	strstr()
d.	strnset()

Discuss

Answer: (c).strstr()

6.	Which of the following function is more appropriate for reading in a multi-word string?
a.	printf();
b.	scanf();
c.	gets();
d.	puts();

Discuss

Answer: (c).gets();

7.	Strcat function adds null character
a.	Only if there is space
b.	Always
c.	Depends on the standard
d.	Depends on the compiler

Discuss

Answer: (b).Always

8.	The return-type used in String operations are
a.	void only
b.	void and (char *) only
c.	void and int only
d.	void, int and (char *) only

Discuss

Answer: (d).void, int and (char *) only

9.	String operation such as strcat(s, t), strcmp(s, t), strcpy(s, t) and strlen(s) heavily rely upon.
a.	Presence of NULL character
b.	Presence of new-line character
c.	Presence of any escape sequence
d.	None of the mentioned

Discuss

Answer: (a).Presence of NULL character

10.	Which pre-defined function returns a pointer to the last occurence of a character in a string?
a.	strchr(s, c);
b.	strrchr(s, c);
c.	strlchr(s, c);
d.	strfchr(s, c);

Discuss

Answer: (b).strrchr(s, c);