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"Strstr (I think I should call it a function) tests

whether a substring is present in a larger string. Returns a pointer to
the first occurrence of the substring in the larger string, or zero if the substring is not
present. (When the substring is empty, strstr returns a pointer to the first character
of the larger string.)"

I understand the first sentance, but I don't understand the second and third sentances. Could someone explain? Thank you.

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It is because that is very poorly worded, what are you reading?

do you know what pointers and character arrays are and how they relate to each other?

oh, wait

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