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- Question
Which of the following function is used to find the first occurrence of a given string in another string?
Options- A. strchr()
- B. strrchr()
- C. strstr()
- D. strnset()
- Correct Answer
- strstr()
ExplanationThe function strstr() Finds the first occurrence of a substring in another stringDeclaration: 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 = "CuriousTab", *str2 = "ia", *ptr; ptr = strstr(str1, str2); printf("The substring is: %s\n", ptr); return 0; }Output: The substring is: iaCURIOUSTAB
Strings problems
Search Results
- 1. What would be the equivalent pointer expression for referring the array element a[i][j][k][l]
Options- A. ((((a+i)+j)+k)+l)
- B. *(*(*(*(a+i)+j)+k)+l)
- C. (((a+i)+j)+k+l)
- D. ((a+i)+j+k+l) Discuss
Correct Answer: *(*(*(*(a+i)+j)+k)+l)
- 2. How many bytes are occupied by near, far and huge pointers (DOS)?
Options- A. near=2 far=4 huge=4
- B. near=4 far=8 huge=8
- C. near=2 far=4 huge=8
- D. near=4 far=4 huge=8 Discuss
Correct Answer: near=2 far=4 huge=4
Explanation:
near=2, far=4 and huge=4 pointers exist only under DOS. Under windows and Linux every pointers is 4 bytes long.- 3. A pointer is
Options- A. A keyword used to create variables
- B. A variable that stores address of an instruction
- C. A variable that stores address of other variable
- D. All of the above Discuss
Correct Answer: A variable that stores address of other variable
- 4. Can you combine the following two statements into one?
char *p; p = (char*) malloc(100);
Options- A. char p = *malloc(100);
- B. char *p = (char) malloc(100);
- C. char *p = (char*)malloc(100);
- D. char *p = (char *)(malloc*)(100); Discuss
Correct Answer: char *p = (char*)malloc(100);
- 5. If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?
Options- A. .
- B. &
- C. *
- D. -> Discuss
Correct Answer: ->
- 6. How will you print \n on the screen?
Options- A. printf("\n");
- B. echo "\\n";
- C. printf('\n');
- D. printf("\\n"); Discuss
Correct Answer: printf("\\n");
Explanation:
The statement printf("\\n"); prints '\n' on the screen.- 7. The library function used to find the last occurrence of a character in a string is
Options- A. strnstr()
- B. laststr()
- C. strrchr()
- D. strstr() Discuss
Correct Answer: strrchr()
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 CuriousTab.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
- 8. Which of the following function sets first n characters of a string to a given character?
Options- A. strinit()
- B. strnset()
- C. strset()
- D. strcset() Discuss
Correct Answer: strnset()
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
- 9. If the two strings are identical, then strcmp() function returns
Options- A. -1
- B. 1
- C. 0
- D. Yes Discuss
Correct Answer: 0
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
- 10. Which of the following function is correct that finds the length of a string?
Options- A.
int xstrlen(char *s) { int length=0; while(*s!='\0') { length++; s++; } return (length); } - B.
int xstrlen(char s) { int length=0; while(*s!='\0') length++; s++; return (length); } - C.
int xstrlen(char *s) { int length=0; while(*s!='\0') length++; return (length); } - D.
int xstrlen(char *s) { int length=0; while(*s!='\0') s++; return (length); }
Discuss
Correct Answer:int xstrlen(char *s) { int length=0; while(*s!='\0') { length++; s++; } return (length); }
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[] = "CuriousTab"; printf("Length = %d\n", xstrlen(d)); return 0; }Output: Length = 8
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