6.7 function printf() -- 1

6.7 function printf() -- 1

• stdio.h
• Variable argument list
• Format specifier string first argument.
• Returns the number of characters printed (negative on error).
• Calls fprintf()
• Conversion specification
  • %
  • zero or more flags
  • Optional width specifier
  • Optional precision control
  • Conversion specifier
• Print conversion specifiers.

  signed decimal	d
  signed decimal	i
  octal	o
  Uppercase Hex	X
  Lowercase Hex	x
  unsigned decimal	u
  single character	c
  string	s
  floating point	f
  exponential notation	e
  mixed (f&e) notation	g
  %	%

• Flags (in any order)

  Left justify	-
  Always print sign	+
  Leave a space for the sign	space
  Pad with leading zeros	0
  Alternate output	#
  Minimum width	number
  Period	width.precision
  Short Integer	h
  Long integer and real	l
  Long Double	L

  Note: Width or precision or both may be represented with an *, in which case the value comes from the next arguments. Kernighan p 244.

6.7 function printf() -- 1