C program to implement own strstr() function
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Severity: 8192
Message: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated
Filename: libraries/Filtered_db.php
Line Number: 23
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Here, we will implement a user-defined function to perform a similar operation to the strstr() function. The strstr() function is used to find the first occurrence of a specified substring within the string and returns the pointer to the calling function. It returns NULL if the substring is not found within the string.
Program:
The source code to implement own strstr() function is given below. The given program is compiled and executed using GCC compile on UBUNTU 18.04 OS successfully.
Output:
Explanation:
In the above program, we created two functions StrStr() and main(). The StrStr() is a user-defined function, which is used to find the first occurrence of a specified substring within the string and returns the pointer to the calling function. It returns NULL if the substring is not found within the string.
In the main() function, we created a string str initialized with "India is great country". Then we called StrStr() function to find the specified substring "great" within the string and print the result on the console screen.
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