strstr function : Finds first occurrence of sub-string in other string

1. Finds the first occurrence of a sub string in another string
2. Main Purpose : Finding Substring
3. Header File : String.h
4. Checks whether s2 is present in s1 or not
5. On success, strstr returns a pointer to the element in s1 where s2 begins (points to s2 in s1).
6. On error (if s2 does not occur in s1), strstr returns null.

     char *strstr(const char *s1, const char *s2);

#include<stdio.h>
#include<string.h>

int main(void)
{
   char *str1 = "c4learn.blogspot.com", *str2 = "spot", *ptr;
   ptr = strstr(str1, str2);
   printf("The substring is: %sn", ptr);
   return 0;
}

   The substring is: spot.com

#include<stdio.h>
#include<string.h>

void main()
{
   char *ptr;
   ptr = strstr("c4learn.blogspot.com","spot");
   printf("The substring is: %sn", ptr);
}

   The substring is: spot.com

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