C(♯4) 8-string bass chord

How to play C(♯4) on 8-string bass

The most common way, the first shape above: your index finger on the F♯ string at the 6th fret, your middle finger on the B string at the 7th fret, your little finger on the E string at the 8th fret and your ring finger on the A string at the 7th fret. Don’t play the D, G, C and F strings.

From the F♯ string 6 7 8 7 x x x x (x: not played, 0: open)

What notes are in C(♯4)?

C(♯4), C major with sharp four, no fifth, is C, E and F♯: the root (C), the major third (E) and the augmented fourth (F♯). Its formula is 1 3 ♯4.