import Text.Printf(printf)
disp = putStr . format " " (printf "%.2f")
>>> format "{} + {} = {}" 2 2 4 2 + 2 = 4You can use arbitrary formatters:
>>> format "0x{} + 0x{} = 0x{}" (hexF 130) (hexF 270) (hexF (130+270)) 0x82 + 0x10e = 0x190
>>> format "{:s}, {:d}, {:.4f}" "hello" 123 pi "hello, 123, 3.1416" >>> format "{1:s}, {0:d}, {2:.4f}" 123 "hello" pi "hello, 123, 3.1416" >>> format "{:s} {:d} {pi:.4f}" "hello" 123 ("pi" := pi) "hello, 123, 3.1416"See Format to learn more about format string syntax. See FormatArg to learn how to derive FormatArg for your own data types.