···
------------------------------------------------------------------------
Returns the string resulting from applying format_string to any
additional arguments. Within the format string, any characters
other than format sequences are copied to the result. A format
sequence consists of a percent sign, followed by optional flags,
width, and precision indicators, then terminated with a field type
character. The field type controls how the corresponding sprintf
argument is to be interpreted, while the flags modify that
interpretation. The field type characters are listed in the table
at the end of this section. The flag characters are:
Flag | Applies to | Meaning
---------+--------------+-----------------------------------------
space | bdeEfgGiouxX | Leave a space at the start of
> > positive numbers.
---------+--------------+-----------------------------------------
(digit)$ | all | Specifies the absolute argument number
> > for this field. Absolute and relative
> > argument numbers cannot be mixed in a
> > sprintf string.
---------+--------------+-----------------------------------------
# | beEfgGoxX | Use an alternative format. For the
> > conversions `o', `x', `X', and `b',
> > prefix the result with ``0'', ``0x'', ``0X'',
> > and ``0b'', respectively. For `e',
> > `E', `f', `g', and 'G', force a decimal
> > point to be added, even if no digits follow.
> > For `g' and 'G', do not remove trailing zeros.
---------+--------------+-----------------------------------------
+ | bdeEfgGiouxX | Add a leading plus sign to positive numbers.
---------+--------------+-----------------------------------------
- | all | Left-justify the result of this conversion.
---------+--------------+-----------------------------------------
0 (zero) | bdeEfgGiouxX | Pad with zeros, not spaces.
---------+--------------+-----------------------------------------
* | all | Use the next argument as the field width.
> > If negative, left-justify the result. If the
> > asterisk is followed by a number and a dollar
> > sign, use the indicated argument as the width.
The field width is an optional integer, followed optionally by a
period and a precision. The width specifies the minimum number of
characters that will be written to the result for this field. For
numeric fields, the precision controls the number of decimal
places displayed. For string fields, the precision determines the
maximum number of characters to be copied from the string. (Thus,
the format sequence %10.10s will always contribute exactly ten
characters to the result.)
The field types are:
Field | Conversion
------+--------------------------------------------------------------
b | Convert argument as a binary number.
c | Argument is the numeric code for a single character.
d | Convert argument as a decimal number.
E | Equivalent to `e', but uses an uppercase E to indicate
> the exponent.
e | Convert floating point argument into exponential notation
> with one digit before the decimal point. The precision
> determines the number of fractional digits (defaulting to six).
f | Convert floating point argument as [-]ddd.ddd,
> where the precision determines the number of digits after
> the decimal point.
G | Equivalent to `g', but use an uppercase `E' in exponent form.
g | Convert a floating point number using exponential form
> if the exponent is less than -4 or greater than or
> equal to the precision, or in d.dddd form otherwise.
i | Identical to `d'.
o | Convert argument as an octal number.
p | The valuing of argument.inspect.
s | Argument is a string to be substituted. If the format
> sequence contains a precision, at most that many characters
> will be copied.
u | Treat argument as an unsigned decimal number. Negative integers
> are displayed as a 32 bit two's complement plus one for the
> underlying architecture; that is, 2 ** 32 + n. However, since
> Ruby has no inherent limit on bits used to represent the
> integer, this value is preceded by two dots (..) in order to
> indicate a infinite number of leading sign bits.
X | Convert argument as a hexadecimal number using uppercase
> letters. Negative numbers will be displayed with two
> leading periods (representing an infinite string of
> leading 'FF's.
x | Convert argument as a hexadecimal number.
> Negative numbers will be displayed with two
> leading periods (representing an infinite string of
> leading 'ff's.
Examples:
sprintf("%d %04x", 123, 123) #=> "123 007b"
sprintf("%08b '%4s'", 123, 123) #=> "01111011 ' 123'"
sprintf("%1$*2$s %2$d %1$s", "hello", 8) #=> " hello 8 hello"
sprintf("%1$*2$s %2$d", "hello", -8) #=> "hello -8"
sprintf("%+g:% g:%-g", 1.23, 1.23, 1.23) #=> "+1.23: 1.23:1.23"
sprintf("%u", -123) #=> "..4294967173"
Dan
On Wed, Apr 16, 2008 at 9:38 PM, Clement Ow <clement.ow@asia.bnpparibas.com> wrote:
Thanks guys of the prompt reply! However, i'll need help the
explanations though.. Really appreciate that 
Jesús Gabriel y Galán wrote:
> On Wed, Apr 16, 2008 at 4:47 PM, Rob Biedenharn > > <Rob@agileconsultingllc.com> wrote:
>
>> or:
>> > start = Time.now
>> => Wed Apr 16 10:41:03 -0400 2008
>> > finish = Time.now
>> => Wed Apr 16 10:45:53 -0400 2008
>> > elapsed = finish.to_f - start.to_f # note to_f to keep fractional
>> seconds
>
> Yep, I assumed he wanted to stop at the seconds level.
>
>> => 289.695813894272
>> > mins, secs = elapsed.divmod 60.0
>> => [4, 49.6958138942719]
>> > puts("%3d:%04.2f"%[mins.to_i, secs])
how this line work? "%3d" and %04.2f" means selecting min and secs
respectively?
>> 4:49.70
>> => nil
>
> I always forget about divmod, it's a cool little method 
>
> Jesus.
--
Posted via http://www.ruby-forum.com/\.
