C major has no sharps or flats. Here's the signature on the staff, the full scale, its relative minor, and the trick to recognize it instantly.
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C major is the anchor of the whole system: nothing sits between the clef and the notes. So any sharp or flat you meet in a C-major piece is a deliberate accidental, never part of the key.
The C major scale runs C, D, E, F, G, A, B. Every note in the piece takes the key's accidentals automatically, which is exactly what the signature saves you from writing note by note.
C major shares its signature — no sharps or flats — with its relative minor, A minor, a minor third below the tonic. They use the same seven pitches; what tells them apart is which note the music settles on and treats as home.
C major has no sharps or flats.
The relative minor of C major is A minor — it shares the identical key signature (no sharps or flats).
The C major scale is C, D, E, F, G, A, B.
Keep practicing: key signature quiz · circle of fifths · key trainer
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