C Programming - Strings

Why C Programming Strings?

In this section you can learn and practice C Programming Questions based on "Strings" and improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc.) with full confidence.

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Where can I get C Programming Strings Interview Questions and Answers (objective type, multiple choice)?

Here you can find objective type C Programming Strings questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided.

How to solve C Programming Strings problems?

You can easily solve all kind of C Programming questions based on Strings by practicing the objective type exercises given below, also get shortcut methods to solve C Programming Strings problems.

Exercise :: Strings - General Questions

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()

Answer: Option B

Explanation:

Declaration:

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

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

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


2. 

If the two strings are identical, then strcmp() function returns

A. -1
B. 1
C. 0
D. Yes

Answer: Option C

Explanation:

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


3. 

How will you print \n on the screen?

A. printf("\n");
B. echo "\\n";
C. printf('\n');
D. printf("\\n");

Answer: Option D

Explanation:

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


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()

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

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


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()

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