print and printf

• print does default formatting
  commas between printed items result in spaces

• printf is like C's printf

• printf "%d", n
  prints n as a decimal with no new-line

• %3d = decimal width 3

• %4x = hexadecimal

• %c = character, either a number is converted or first character

• %12s = string width 12 (may overflow if the string is longer)

• %12.12s = string width 12 (no overflow)

• %12.16s = string width 12 to 16

• %8.3f = floating point width 8 with 3 digits for the fraction

• Placing - before the width means left justify