Correct Option - D

Explanation

The statement printf("\\n"); prints '\n' on the screen.

Correct Option - C

Explanation

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

Correct Option - C

Explanation

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 tos2 in s1).
On error (if s2 does not occur in s1), strstr returns null.

Example:

#include 
#include 

int main(void)
{
   char *str1 = "IndiaBIX", *str2 = "ia", *ptr;

   ptr = strstr(str1, str2);
   printf("The substring is: %s\n", ptr);
   return 0;
}

Correct Option - B

Explanation

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

#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;

}

Correct Option - C

Explanation

 strcmp(const char *s1, const char*s2);

The strcmp return an int value that is

if s1

if s1 == s2 returns 0

if s1 > s2 returns a value > 0