With the inclusion of sharps and flats, there are 12 different notes within one octave as shown below. This is commonly known as the chromatic scale. Note that there are no sharps or flats between B and C, and E and F.
The diagram below displays all the notes in the first position including sharps and flats. The notes on each string are also represented in music.
A sharp or flat, when placed before a note, affects the same note if it re-occurs in that bar. It does not, however, affect notes in the next bar. Also used in the following example is a natural sign (@) which cancels the effect of a sharp or flat.