As the composer, it's up to you. Some contemporary composers will not use a key signature, and instead will use accidentals throughout. Otherwise, it's probably easiest to use the key signature that best reflects the overall tonal center of the song.
Look At The Key Signature. It Will Help You.
There are no sharps or flats in C Major.
2 flats B-flat and E-flat
There aren't any sharps in c minor - there are three flats, b flat, e flat and a flat.
zero
A major has 3 sharps, A minor has no sharps or flats.
There are no sharps or flats in C Major.
If you're referring sharps and flats in piano keys, there are none in a Cmaj scale.None, if you are talking about sharps and flats, none my friend. Easiest scale in the book.
2 flats B-flat and E-flat
2 flats B-flat and E-flat
There aren't any sharps in c minor - there are three flats, b flat, e flat and a flat.
Four sharps
zero
There can be a total of seven flats (or sharps) in a key signature.
A major has 3 sharps, A minor has no sharps or flats.
88
There are 3 sharps. F, C, and G. You can figure this out by knowing the order of the sharps: F, C, G, D, A, E, and B. Or, Fullerton College Gets Dull And Extremely Boring. You go to the the last sharp in the scale and go one step down. EX: In E Major, you go one step down from E, giving you D. So you know that there's F, C, G, and D sharp.
There are two flats in the key of B flat major: B flat and E flat.