What are the notes which are a semitone apart to c major scale?

In the C major scale, the notes are C, D, E, F, G, A, and B. The notes that are a semitone apart from this scale are C and C# (or Db), D and D# (or Eb), E and F, F and F# (or Gb), G and G# (or Ab), A and A# (or Bb), and B and C. Thus, the semitone relationships occur between adjacent notes in the scale and between each note and its corresponding sharp or flat.