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Which of the following function is used to find the first occurrence of a given string in another string?

strchr()

strrchr()

strstr()

strnset()

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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 
 #include   

 int main(void) 
 {   
      char *str1 = "FresherGate", *str2 = "ia", *ptr;   
     
      ptr = strstr(str1, str2);   
      printf("The substring is: %s\n", ptr);  
      return 0;
 }