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Which of the following function returns a pointer to the located string or a null pointer if string is not found.
- a)strtok()
- b)strstr()
- c)strspn()
- d)strrchr()
Correct answer is option 'B'. Can you explain this answer?
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Which of the following function returns a pointer to the located strin...
Understanding the Function: strstr()
The correct answer is option 'B', `strstr()`. This function is part of the C standard library and is used for string manipulation.
What does strstr() do?
- `strstr()` searches for a substring within a larger string.
- It takes two parameters: the main string and the substring to search for.
- If the substring is found, it returns a pointer to the first occurrence of the substring in the main string.
- If the substring is not found, it returns a null pointer.
Why is strstr() the correct choice?
- The primary purpose of `strstr()` is to locate a substring.
- Its behavior of returning a pointer (or null) aligns perfectly with the question's requirement.
- Other functions listed do not fulfill this specific criterion.
Comparison with Other Options:
- strtok(): This function is used for tokenizing strings, not for searching substrings.
- strspn(): This function calculates the length of the initial segment of a string that consists only of characters from a specified set. It does not return a pointer to a substring.
- strrchr(): This function locates the last occurrence of a character in a string, not a substring.
Conclusion
In conclusion, `strstr()` is the correct function to use when you need to find a substring within a string and receive a pointer to its location, making it the best choice among the options provided.
The correct answer is option 'B', `strstr()`. This function is part of the C standard library and is used for string manipulation.
What does strstr() do?
- `strstr()` searches for a substring within a larger string.
- It takes two parameters: the main string and the substring to search for.
- If the substring is found, it returns a pointer to the first occurrence of the substring in the main string.
- If the substring is not found, it returns a null pointer.
Why is strstr() the correct choice?
- The primary purpose of `strstr()` is to locate a substring.
- Its behavior of returning a pointer (or null) aligns perfectly with the question's requirement.
- Other functions listed do not fulfill this specific criterion.
Comparison with Other Options:
- strtok(): This function is used for tokenizing strings, not for searching substrings.
- strspn(): This function calculates the length of the initial segment of a string that consists only of characters from a specified set. It does not return a pointer to a substring.
- strrchr(): This function locates the last occurrence of a character in a string, not a substring.
Conclusion
In conclusion, `strstr()` is the correct function to use when you need to find a substring within a string and receive a pointer to its location, making it the best choice among the options provided.
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Which of the following function returns a pointer to the located strin...
The strstr() function is used to return a pointer to the located string, or if string is not found a null pointer is returned.
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