Major third
A C to a G would be a perfect fifth. Because the interval was decreased by 2 half-steps (by sharping the C and flatting the G), the interval C sharp to G flat is a double-diminished 5th.
a
B-flat to C-sharp is an augmented 2nd.
the interval is a 3rd.
a flat( or g sharp),a, b flat( or a sharp), b, c flat (or b sharp), c, c sharp (or d flat), d, e flat (or d sharp), e, f flat( or e sharp), f, f sharp ( or g flat)and g.
a flat( or g sharp),a, b flat( or a sharp), b, c flat (or b sharp), c, c sharp (or d flat), d, e flat (or d sharp), e, f flat( or e sharp), f, f sharp ( or g flat)and g.
The enharmonic equivalent to A-flat is G-sharp; The enharmonic equivalent to G-flat is F-sharp.
C sharp/D flat, D sharp/E flat, F sharp/G flat, G sharp/A flat, A sharp/B flat
E-flat can also be D-sharp, F-sharp can be G-flat, and A-flat can be G-sharp
G sharp is also A flat.
C, C sharp/D flat, D, D sharp/E flat, E, F, F sharp/G flat, G, G sharp/A flat, A, A sharp/B flat, B, C.
if you are talking about notes: c c sharp/ D flat d d sharp/ e flat e f f sharp/ g flat g g sharp/ a flat a a sharp/ b flat b etc...