From: Fumiaki Sakamoto <ght8270407fs@...>
Date: 2014-04-23T11:25:16+09:00
Subject: [ruby-list:49801]	小数点以下の表示で質問があります。

> 1L
bZ
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B2gpLdq

[ Av
P
[VEM1L`.*F/3jH"LE
A
1L
bZ
[WLj\=MSp35-G]fi1F*E+H"	B\+* h\7
B

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$B$*K;$7$$Cf$r62=L$G$9$,<ALd$,$"$j$^$9!#(B

$B2<5-$NMM$J%W%m%0%i%`$r<B9T$9$k$H!"0J2<$N$h$&$K$J$j$^$9!#(B

ruby --version
ruby 1.9.3p484  $B!D(B [amd64-freebsd]

$B!c%W%m%0%i%`!d(B
require 'rational'
a = 0.1  $B$"$k$$$O!!(Ba = Rational(1, 10)
b = 9.0
i = 1
c = 0.0
while  i < 20  do
     c = c + b * a ** i
     output = sprintf("%18.16f", c)
     print   i, " ", c, "   ", output, "(J\n"
end

$B!c7k2L!d(B
1 0.9   0.9000000000000000
2 0.99   0.9900000000000000
3 0.999   0.9990000000000000
4 0.9999   0.9999000000000000
5 0.99999   0.99999000000000000
6 0.9999990000000001   0.9999990000000001
7 0.9999999   0.9999999000000001
8 0.9999999900000001   0.9999999900000001
9 0.999999999   0.9999999990000000
10 0.9999999999   0.9999999999000000
11 0.99999999999   0.9999999999900000
12 0.999999999999   0.9999999999990000
13 0.9999999999999   0.9999999999999000
14 0.99999999999999   0.9999999999999900
15 0.999999999999999   0.9999999999999990
16 0.9999999999999999   0.9999999999999999
17 1.0   1.0000000000000000
18 1.0   1.0000000000000000
19 1.0   1.0000000000000000

<$B<ALd(B>
6$BHVL\$H(B7$BHVL\$N7k2L$,7e?t;XDj$7$F$$$J$/$F$b(B16$B7e$GI=<($5$l$^$7$?!#(B
$B>.?tE@0J2<$r(B16$B7e$K$7$FI=<($5$;$k$H(B7$BHVL\$bIaDL$K9M$($k$H(B16$B7e$GI=<($5$l$F$$$F$b(B
$B$*$+$7$/$J$$$H;W$($k$N$K$=$&$O$J$i$J$+$C$?$N$O2?8N$G$7$g$&$+!)(B

$B59$7$/$*4j$$$$$?$7$^$9!#(B

$B:d85;KL@(B





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<html><head></head><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: s=
pace; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size:=
 14px; font-family: '=1B$B#M#S=1B(B =1B$B#P%4%7%C%/=1B(B', 'MS PGothic', sans-serif;=
"><div>=1B$B$*K;$7$$Cf$r62=3DL$G$9$,<ALd$,$"$j$^$9!#=1B(B</div><div><br></div><div=
>=1B$B2<5-$NMM$J%W%m%0%i%`$r<B9T$9$k$H!"0J2<$N$h$&$K$J$j$^$9!#=1B(B</div><div><b=
r></div><div>ruby --version</div><div>ruby 1.9.3p484 &nbsp;&#8230; [amd64-fr=
eebsd]</div><div><br></div><div>=1B$B!c%W%m%0%i%`!d=1B(B</div><div>require 'rati=
onal'</div><div>a =3D 0.1 &nbsp;=1B$B$"$k$$$O!!=1B(Ba =3D Rational(1, 10)</div><div>=
b =3D 9.0</div><div>i =3D 1</div><div>c =3D 0.0</div><div>while &nbsp;i &lt; 20 &n=
bsp;do</div><div>&nbsp; &nbsp; &nbsp;c =3D c + b *&nbsp;<span style=3D"font-weig=
ht: bold;">a&nbsp;</span>** i</div><div>&nbsp; &nbsp; &nbsp;output =3D sprintf=
("%18.16f", c)</div><div>&nbsp; &nbsp; &nbsp;print &nbsp; i, " ", c, " &nbsp=
; ", output, "=1B(J\n"</div><div>end</div><div><br></div><div>=1B$B!c7k2L!d=1B(B</=
div><div>1 0.9 &nbsp; 0.9000000000000000</div><div>2 0.99 &nbsp; 0.990000000=
0000000</div><div>3 0.999 &nbsp; 0.9990000000000000</div><div>4 0.9999 &nbsp=
; 0.9999000000000000</div><div>5 0.99999 &nbsp; 0.99999000000000000</div><di=
v>6 0.9999990000000001 &nbsp; 0.9999990000000001</div><div>7 0.9999999 &nbsp=
; 0.9999999000000001</div><div>8 0.9999999900000001 &nbsp; 0.999999990000000=
1</div><div>9 0.999999999 &nbsp; 0.9999999990000000</div><div>10 0.999999999=
9 &nbsp; 0.9999999999000000</div><div>11 0.99999999999 &nbsp; 0.999999999990=
0000</div><div>12 0.999999999999 &nbsp; 0.9999999999990000</div><div>13 0.99=
99999999999 &nbsp; 0.9999999999999000</div><div>14 0.99999999999999 &nbsp; 0=
.9999999999999900</div><div>15 0.999999999999999 &nbsp; 0.9999999999999990</=
div><div>16 0.9999999999999999 &nbsp; 0.9999999999999999</div><div>17 1.0 &n=
bsp; 1.0000000000000000</div><div>18 1.0 &nbsp; 1.0000000000000000</div><div=
>19 1.0 &nbsp; 1.0000000000000000</div><div><br></div><div>&lt;=1B$B<ALd=1B(B&gt=
;</div><div>6=1B$BHVL\$H=1B(B7=1B$BHVL\$N7k2L$,7e?t;XDj$7$F$$$J$/$F$b=1B(B16=1B$B7e$GI=
=3D<($5$l$^$7$?!#=1B(B</div><div>=1B$B>.?tE@0J2<$r=1B(B16=1B$B7e$K$7$FI=3D<($5$;$k$H=1B(B7=
=1B$BHVL\$bIaDL$K9M$($k$H=1B(B16=1B$B7e$GI=3D<($5$l$F$$$F$b$*$+$7$/$J$$$H;W$($k$N$K$=
=3D$&$O$J$i$J$+$C$?$N$O2?8N$G$7$g$&$+!)=1B(B</div><div><br></div><div>=1B$B59$7$/$=
*4j$$$$$?$7$^$9!#=1B(B</div><div><br></div><div>=1B$B:d85;KL@=1B(B</div><div><br><=
/div><div><br></div></body></html>

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