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In page Accidental (music):

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An accidental applies to the note that immediately follows it, and to subsequent instances of that note in the same measure unless it is canceled by another accidental. A sharp raises a note's pitch by a semitone and a flat lowers it by a semitone. Double flats (double flat) or sharps (double sharp) may also be used, which alter the unmodified note by two semitones. If a note with an accidental is tied, the accidental continues to apply, even if the note it is tied to is in the next measure. If a note has an accidental and the note is repeated in a different octave within the same measure the accidental is usually repeated, although this convention is not universal.[citation needed]