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1.
Which of the following function sets first n characters of a string to a given character?
Answer & Solution
Answer: (B) strnset()
Solution:
Declaration:

char *strnset(char *s, int ch, size_t n); Sets the first n characters of s to ch

#include
#include
int main(void)
{
char *string = "abcdefghijklmnopqrstuvwxyz";
char letter = 'x';
printf("string before strnset: %s\n", string);
strnset(string, letter, 13);
printf("string after strnset: %s\n", string);
return 0;
}
Output:

string before strnset: abcdefghijklmnopqrstuvwxyz
string after strnset: xxxxxxxxxxxxxnopqrstuvwxyz
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2.
If the two strings are identical, then strcmp() function returns
Answer & Solution
Answer: (C) 0
Solution:
Declaration: strcmp(const char *s1, const char*s2);

The strcmp return an int value that is

if s1 < s2 returns a value < 0

if s1 == s2 returns 0

if s1 > s2 returns a value > 0
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3.
How will you print \n on the screen?
Answer & Solution
Answer: (D) printf("\\n");
Solution:
The statement printf("\\n"); prints '\n' on the screen. close
4.
The library function used to find the last occurrence of a character in a string is
Answer & Solution
Answer: (C) strrchr()
Solution:
Declaration: char *strrchr(const char *s, int c);

It scans a string s in the reverse direction, looking for a specific character c.

Example:

#include
#include
int main(void)
{
char text[] = "I learn through IndiaBIX.com";
char *ptr, c = 'i';
ptr = strrchr(text, c);
if (ptr)
printf("The position of '%c' is: %d\n", c, ptr-text);
else
printf("The character was not found\n");
return 0;
}
Output:
The position of 'i' is: 19
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5.
Which of the following function is used to find the first occurrence of a given string in another string?
Answer & Solution
Answer: (C) strstr()
Solution:
The function strstr() Finds the first occurrence of a substring in another string

Declaration: char *strstr(const char *s1, const char *s2);

Return Value:
On success, strstr returns a pointer to the element in s1 where s2 begins (points to s2 in s1).
On error (if s2 does not occur in s1), strstr returns null.
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