Digits in format and formatc in r

digits in format and formatc in r

format(x, digits = y) #y = no. of significant figure 

formatC(x, format = NULL, digits = y) 
#format = g #Fixed format unless sci save space
#		= f #Fixed format
#		= e #Sci format
#y = no. of significant figure (sci)
#  = no. of digit after decimal point (fixed)