C Sharp Major has 6 key signatures which are all sharps:
There is also another major key that has 7 sharp keys.
There are no sharps or flats in C Major.
The C major scale...
A major has 3 sharps, A minor has no sharps or flats.
There are no flats or sharps. Its relative major scale is C major, which has all of the same notes.
E Major
The three sharps in A major are F, C, and G.
The major scale with 2 sharps is D major, they are F and C sharp.
C major has no sharps or flats.
There are no sharps or flats in C Major.
A major
The major scale with five sharps is B major. The five sharps, in written order, according to the key signature, are F#, C#, G#, D#, A#.
The scale with four sharps in its key signature is the E major scale.
The B major scale has 5 sharps: F#, C#, G#, D#, A#.
The D major scale has F# and C#.
C major and A minor both have no sharps or flats.
The C major scale...
C major scale and A minor.