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Description | |||||||||||
A C printf like formatter. | |||||||||||
Synopsis | |||||||||||
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Documentation | |||||||||||
printf :: PrintfType r => String -> r | |||||||||||
Format a variable number of arguments with the C-style formatting string. The return value is either String or (IO a). The format string consists of ordinary characters and /conversion specifications/, which specify how to format one of the arguments to printf in the output string. A conversion specification begins with the character %, followed by one or more of the following flags: - left adjust (default is right adjust) + always use a sign (+ or -) for signed conversions 0 pad with zeroes rather than spaces followed optionally by a field width: num field width * as num, but taken from argument list followed optionally by a precision: .num precision (number of decimal places) and finally, a format character: c character Char, Int, Integer, ... d decimal Char, Int, Integer, ... o octal Char, Int, Integer, ... x hexadecimal Char, Int, Integer, ... X hexadecimal Char, Int, Integer, ... u unsigned decimal Char, Int, Integer, ... f floating point Float, Double g general format float Float, Double G general format float Float, Double e exponent format float Float, Double E exponent format float Float, Double s string String Mismatch between the argument types and the format string will cause an exception to be thrown at runtime. Examples: > printf "%d\n" (23::Int) 23 > printf "%s %s\n" "Hello" "World" Hello World > printf "%.2f\n" pi 3.14 | |||||||||||
hPrintf :: HPrintfType r => Handle -> String -> r | |||||||||||
Similar to printf, except that output is via the specified Handle. The return type is restricted to (IO a). | |||||||||||
class PrintfType t | |||||||||||
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class HPrintfType t | |||||||||||
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class PrintfArg a | |||||||||||
class IsChar c | |||||||||||
Produced by Haddock version 2.6.0 |