How can I play a c diminished 7 chord on the guitar?

To play a C diminished 7 chord on the guitar, place your index finger on the 3rd fret of the A string, your middle finger on the 4th fret of the D string, your ring finger on the 3rd fret of the G string, and your pinky on the 4th fret of the B string. Strum from the A string down to the high E string.