Syntax Declaration for strstr function
int strstr(char*, char*);What Does strstr() Return?
The strstr() function searches the given string in the specified main string and returns the pointer to the first occurrence of the given string.
Does Strstr Modify the String?
All the const char * is telling you is that strstr is not going to modify the string you pass into it. Whether you modify the returned string or not is up to you as it is your string!
How to Use strset
The h header file supports all the string functions in C language.
C String Functions
| Function | Description |
|---|---|
| strlwr() | Converts string to lowercase |
| strupr() | Converts string to uppercase |
| strrev() | Reverses the given string |
| strset() | Sets all characters in a string to a given character |
Is Strstr Case-sensitive?
It’s a cousin to the standard C library string comparison function, strstr(). The word "case" sandwiched inside means that the strings are compared in a case-insensitive way. Otherwise, both functions are identical.
How to Implement Strstr in C++
strStr() Implementation in C++
The following implementation of strStr() method in C++ has a time complexity O(MN) where M and N are the lengths of the input haystack and needle string.
The outer loop should be from 0 to the length of M-N+1. And the inner loop checks if the substring of haystack matches the needle.