C Programming - Strings

Answer: Option D

Explanation:

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

Answer: Option A

Explanation:

Option A is the correct function to find the length of given string.

Example:

#include<stdio.h>

int xstrlen(char *s)
{
    int length=0;
    while(*s!='\0')
    { length++; s++; }
    return (length);
}

int main()
{
    char d[] = "IndiaBIX";
    printf("Length = %d\n", xstrlen(d));
    return 0;
}

Output: Length = 8

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

Example:

#include <stdio.h>
#include <string.h>

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

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

Output: The substring is: iaBIX

Answer: Option B

Explanation:

strrev(s) Reverses all characters in s

Example:

#include <string.h>
#include <stdio.h>

int main(void)
{
   char *str = "IndiaBIX";

   printf("Before strrev(): %s\n", str);
   strrev(str);
   printf("After strrev():  %s\n", str);
   return 0;
}

Output:

Before strrev(): IndiaBIX

After strrev(): XIBaidnI

Answer: Option C

Explanation:

gets(); collects a string of characters terminated by a new line from the standard input stream stdin

#include <stdio.h>

int main(void)
{
   char string[80];

   printf("Enter a string:");
   gets(string);
   printf("The string input was: %s\n", string);
   return 0;
}

Output:

Enter a string: IndiaBIX

The string input was: IndiaBIX