$B$3$NLdBj$r2r7h$9$k$K$O!"(Bint $B7?$G$O$J$/!"(B long $B7?$r;H$&$[$+$"$j$^$;$s!#FbIt$GI=8=2DG=$J%5%$%:$rBg$-$/$9$k$N$G$9!#(B
long a = 10000;
long b = 1000000;
long c = a * b / b;
$B$3$l$G@5$7$$7k2L$,F@$i$l$^$7$?!#7e$"$U$l$rL$A3$KKI$0=hJ}d5$O$"$j$^$;$s$,!"0lHL$K3d$C$F$+$i3]$1$k$h$j$b!"3]$1$F$+$i3d$C$?$[$&$,@53N$JCM$,F@$i$l$k2DG=@-$,9b$^$j$^$9!#@53N$JCM$,F@$i$l$k$+$I$&$+$OFbItI=8=$N%5%$%:$K0MB8$7$^$9!#(B
$BHf3S1i;;;R(B
$BHf3S1i;;;R(B
$B>.$J$j(B | < |
$BBg$J$j(B | > |
$B>.$J$j%$%3!<%k(B | <= |
$BBg$J$j%$%3!<%k(B | >= |
$BEy$7$$(B | == |
$BEy$7$/$J$$(B | != |
true
/false
$B$,JV$C$F$/$k>r7o<0$N!"C1=c$J$b$N$r5-=R$9$k$H$-$KIT2D7g$J$b$N$G$9!#;;=Q1i;;;R$H6&$KI,$:3P$($kI,MW$,$"$j$^$9!#(B
$B!VEy$7$$!W$O(B =
$B$G$O$"$j$^$;$s!#(B ==
$B$G$9!#(B =
$B$O!"1&JU$r:8JU$KBeF~$9$k1i;;;R$G$9!'(B x = 10;
$B$^$?!"J8;zNs$NHf3S$K$O(B ==
$B$OITE,@Z$J>l9g$,B?$$$G$7$g$&!#(B$B%a%=%C%I(B equals()
$B$r;H$$$^$7$g$&!#(B
$BIbF0>.?tE@?t$NFCR2p$7$^$7$?!#Fs$D$NL58BBg$O(B float $B7?!"(Bdouble $B7?$HHf3S2DG=$G$9!#(B
double d = 1.0/0;
boolean bln = (d == Double.POSITIVE_INFINITY); // bln $B$K$O(B true $B$,BeF~$5$l$k(B
$BC"$7!"Ii?t$NJ?J}:,$J$I$GJV$5$l$k(B NaN $B$OHf3S$G$-$^$;$s!#(BNaN $B$HHf3S$7$?A4$F$NHf3S<0$O$*$7$J$Y$F(B false $B$rJV$7$^$9!#(B
x < Float.NaN;
x > Float.NaN;
x <= Float.NaN;
x >= Float.NaN;
x == Float.NaN;
x != Float.NaN; // x $B$NCM$K$h$i$:A4$F(B false $B$,JV$k(B
x $B$,(B NaN $B$+$I$&$+D4$Y$k$?$a$K$O!"(B isNaN()
$B$r;H$$$^$9!#(B
boolean bln = Float.isNaN(x); // float $B7?JQ?t(B x $B$NCM$,(B NaN $B$J$i$P(B true
bln = Double.isNaN(y); // double $B7?JQ?t(B y $B$NCM$,(B NaN $B$J$i$P(B true
$BO@M}1i;;;R(B
$BO@M}1i;;;R(B
$BO@M}@Q!J$+$D!K(B AND | & |
$BO@M}OB!JKt$O!K(B OR | | |
$BGSB>E*O@M}OB(B XOR | ^ |
$BH]Dj(B | !($B>r7o(B) |
$BO@M}1i;;;R$O!"(B true
/false
$B$GJV$C$F$/$k>r7o<0$N!"J#;($J>l9g$rI=8=$9$k$H$-$K!"$H$F$bJXMx$G$9!#@'Hs;H$($k$h$&$K$J$j$^$7$g$&!#(B
$BNc$($P!"(B (a < b) & (c < a)
$B$N>l9g!"(B c < a < b
$B$G$"$l$P(B true
$B$,JV$C$F$-$^$9!#(B
$B??!'!{(B, $B56!'!_(B
a | b | a & b | a | b | a ^ b | !a |
$B!{(B | $B!{(B | $B!{(B | $B!{(B | $B!_(B | $B!_(B |
$B!{(B | $B!_(B | $B!_(B | $B!{(B | $B!{(B | $B!_(B |
$B!_(B | $B!{(B | $B!_(B | $B!{(B | $B!{(B | $B!{(B |
$B!_(B | $B!_(B | $B!_(B | $B!_(B | $B!_(B | $B!{(B |
&
$B$ON>J}$H$b??$G$"$k>l9g$r=|$$$F56!"(B |
$B$ON>J}$H$b56$G$"$k>l9g$r=|$$$F??!#(B
$BNc$($P!"$3$NI=$r0l9TL\$+$iFI$`$H!"(B
a = true, b = true$B$N$H$-!"(B
a & b -> true, a | b -> true, a ^ b -> false, !a -> false
$BFs9TL\$O!"(B
a = true, b = false$B$N$H$-!"(B
a & b -> false, a | b -> true, a ^ b -> true, !a -> false
a, b $B$Ol9g$,9M$($i$l$^$9!#(B
- true, false $B$N2?$l$+(B
- true, false $B$N2?$l$+$,BeF~$5$l$F$$$kJQ?t(B
- true, false $B$N2?$l$+$,JV$k>r7o<0(B
a = false;
b = true;
System.out.println(a & b);
System.out.println(a | b);
System.out.println(a ^ b);
System.out.println(! a);
System.out.println((3 < 0) & (10 != 10));
System.out.println((3 < 0) | (10 != 10));
System.out.println((3 < 0) ^ (10 != 10));
System.out.println(!(3 < 0));
$B$b$H$b$H$O(B 0, 1 $B$N%S%C%H1i;;$G$b$"$j$^$9!#(B
0110 1100 & 1010 1110
$B$3$N1i;;<0$O
AND OR XOR
0110 1100 0110 1100 0110 1100
1010 1110 1010 1110 1010 1110
&----------- |---------- ^----------
0010 1100 1110 1110 1100 0010
$B%7%g!<%H%5!<%-%C%H1i;;;R(B
$B>r7o<0$KBP$9$kFs9`1i;;$G$O!"DL>o$O
$B%7%g!<%H%5!<%-%C%H1i;;;R(B
$BO@M}@Q!J$+$D!K(B | && |
$BO@M}OB!JKt$O!K(B | || |
a&&b
$B$J$i!"N>J}$H$b??$G$"$k>l9g$r=|$$$F56$J$N$G!":G=i$K(B a
$B$,I>2A$5$l!"56$G$"$l$P!"(B b
$B$NI>2A$O$;$:$K!"56$rJV$7$^$9!#(B a
$B$,??$G$"$k>l9g$K8B$j(B b
$B$,I>2A$5$l$^$9!#(B
a||b
$B$J$i!"N>J}$H$b56$G$"$k>l9g$r=|$$$F??$J$N$G!":G=i$K(B a
$B$,I>2A$5$l!"??$G$"$l$P!"(B b
$B$NI>2A$O$;$:$K!"??$rJV$7$^$9!#(B a
$B$,56$G$"$k>l9g$K8B$j(B b
$B$,I>2A$5$l$^$9!#(B
$B%7%g!<%H%5!<%-%C%H1i;;;R$N>l9g$O!"1i;;;R$N:8JU$N1i;;BP>]$N??56$K$h$C$F!"1&JU$N1i;;BP>]$,I>2A$5$l$^$;$s!#$7$?$,$C$F!"1&JU$KCM$,JQ2=$9$k$h$&$J<0$r4^$a$F$*$/$H!"$=$N8e$NCM$,>u67$K$h$C$FJQ$o$C$F$7$^$&$3$H$KCm0U$,I,MW$G$9!#(B
$Bl9g$r9M$($F$_$^$7$g$&!'(B
$B=i4|>uBV(B | a = 1, i = 1 | a = 2, i = 1 |
a == 1 | i++ < 5; | i = 2 | i = 2 |
a == 1 || i++ < 5; | i = 1 | i = 2 |
$B7k2L(B | true | true |
$B%7%g!<%H%5!<%-%C%H1i;;;R$N>l9g$O!"1i;;;R$N:8JU$N9`$,??$G$"$l$P!"1&JU$NI>2A$O$7$J$$$N$G!"(B i++
$B$OL5;k$5$l$F(B i
$B$NCM$OJQ$o$j$^$;$s!#(B
$B%S%C%HA`:n1i;;;R(B
$BId9fIU(B n $B%S%C%H1&%7%U%H(B | >>n |
2$B$N(Bn$B>h$N@Z$j |
0 $BKd$a(B n $B%S%C%H1&%7%U%H(B | >>>n |
n $B%S%C%H:8%7%U%H(B | <<n |
2$B$N(Bn$B>h$N>h;;$HF1$8(B |
$B%S%C%HH?E>(B | ~ |
$B%S%C%HNs$r1&$d:8$K%7%U%H$7$^$9!#Fs?J?t$G%S%C%HNs$r$:$i$9$H8@$&$N$O!"(B2 $B$r3]$1$?$j3d$C$?$j$9$k$3$H$HF1$8$G$9!#==?J?t$G3F7e$r1&$d:8$K$:$i$;$P!"(B10 $B$r3]$1$?$j3d$C$?$j$7$F$$$k$3$H$K$J$j$^$9$M!)(B
$B%S%C%HNs$G$O!":8C<$N(B 1 $B%S%C%H$OId9f%S%C%H$G$"$j!"(B "0 = +", "1 = -" $B$K$J$C$F$$$^$9!#1&$K$:$i$7$F6u$$$?$H$3$m$KId9f%S%C%H$GKd$a$k$N$,(B >>
$B$G$9!#1&$K$:$i$7$F!"6u$$$?$H$3$m$r(B 0 $B$GKd$a$k$N$,(B >>>
$B$G$9!#(B
| 0111 0110 | 1101 1010 |
>> | 0011 1011 | 1110 1101 |
$B:8C<$N%S%C%H$OId9f%S%C%HKd$a!#(B(2-n) |
>>> | 0011 1011 | 0110 1101 |
$BId9f%S%C%H$b(B 0 $BKd$a!#(B |
<< | 1110 1100 | 1011 0100 |
$B1&C<$N%S%C%H$O(B 0 $BKd$a!#(B(2n) |
$BNc$($P!"(Bn>>s
$B$N>l9g!"(B-8 $B$O(B 1111 1000 $B$G!"0l2s%7%U%H$G(B -4 $B$,(B 1111 1100$B!"Fs2s%7%U%H$G(B -2 $B$,(B 1111 1110 $B$H$$$&46$8$G$9!#@5$N?t$N>l9g$O(B 0 $BKd$a$G%7%U%H$7!"Ii$N?t$N>l9g$O(B 1 $B$GKd$a$F%7%U%H$7$^$9!#Ii$N?t$N>l9g$K(B 1 $B$GKd$a$k$N$O!"Ii$N@0?t$rI=8=$9$k$?$a$K(B 2 $B$NJd?tI=8=$r;H$C$F$$$k$+$i$G$9!#@0?t$N@5$N?t!"Ii$N?t!J(B2 $B$NJd?tI=8=!K$N>\:Y$K$D$$$F$O!"(BIEEE754 $BIbF0>.?tE@?t(B$B$r;2>H$/$@$5$$!#(B
a << 3 --> a $B$r(B 3 $B%S%C%H:8$K%7%U%H!J(B2 $B$N(B 3 $B>h$r3]$1$?$N$HF1$8!K(B
a >> 4 --> a $B$r(B 4 $B%S%C%H1&$K%7%U%H!J(B2 $B$N(B 4 $B>h$G3d$C$?$N$HF1$8!K(B
a >>> 5 --> a $B$r(B 5 $B%S%C%H1&$K%7%U%H!JId9f%S%C%H$rL5;k$7$F(B 0 $B$GKd$a$F$$$/!K(B
$B$3$l$i$N%7%U%H1i;;;R$H6&$K!"1i;;;R$b;H$o$l$^$9!'(B
a = 1001 1110
~a = 0110 0001
$B#2?J?t$N>\:Y$O?($l$^$;$s$,!"0lHL$K(B "~a = (-a) - 1
" $B$G$9!#(B
$B%G!<%?$NJ];}$G$-$k%S%C%H?t$,B-$j$J$$>l9g$O!"J];}$G$-$kHO0OFb$N2<0L%S%C%HNs$@$1$7$+JV$C$F$-$^$;$s$,!"1i;;Cf$O>/$J$/$H$b(Bint$B7?$G7W;;$5$l$F$$$^$9!#(Bbyte$B7?$J$I!"(Bint$B7?$h$j$b>.$5$J%S%C%H$KBP$7$F1i;;$9$k$H!"7k2L$,M=4|$7$J$$CM$K$J$C$F$7$^$$$^$9$N$G!"(Bint$B7?$+(Blong$B7?$KBP$7$F$@$1MxMQ$7$^$7$g$&!#(B
$B%S%C%H%7%U%H1i;;;R$K$O!"B>$K$b%7%U%HNL$N@)8B!J>jM>4T85!K$J$I$N5,B'$,$"$k$N$G$9$,!"$3$3$G$O@bL@$7$^$;$s!#(B
$B%$%s%/%j%a%s%H!?%G%/%j%a%s%H1i;;;R(B
$B%$%s%/%j%a%s%H!?%G%/%j%a%s%H1i;;;R(B
| | | $B<0Cf$G$NI>2A!"99?7=g=x(B |
$B%$%s%/%j%a%s%H(B | y = y + 1; |
y++; | y $B$rI>2A$7$F$+$i<0$r1i;;$7!"(B y + 1 $B$K99?7(B |
++y; | y + 1 $B$K99?7$7$F$+$i<0$NI>2A!"1i;;(B |
$B%G%/%j%a%s%H(B | y = y - 1; | y--; | $BI>2A$7$F$+$i99?7(B |
--y; | $B99?7$7$F$+$iI>2A(B |
$B%$%s%/%j%a%s%H!?%G%/%j%a%s%H1i;;;R$O!"Fs
x = 10;
y = 100;
z = ++y * x;
++y
$B$N$h$&$KA0CV$5$l$k$H!"4^$^$l$k<0$N1i;;$N@h$K(B++y
$B$,1i;;$5$l$^$9!#B($A!":#$N>l9g$O(B z = (y + 1) * x
$B$H$J$j!"(Bz
$B$O(B 101 * 10
$B$G(B 1010
$B$H$J$j$^$9!#(B
$B0lJ}!"y++ $B$H8eCV$5$l$k$H!"B>$NA4$F$N7W;;$,=*N;$7$F$+$i%$%s%/%j%a%s%H$d%G%/%j%a%s%H$,9T$o$l$^$9!#(B
z = y++ * x;
$B$3$NNc$N>l9g$O8eCV$@$+$i!"$^$:(B z = y * x
$B$,9T$o$l$F$+$i(B y++
$B$,z $B$NCM$O(B 100 * 10
$B$G(B 1000
$B$H$J$j$^$9!#(B
$B%$%s%/%j%a%s%H!?%G%/%j%a%s%H1i;;;R$O!"DL>o$N;;=Q1i;;;R$r;H$&$H!"
$B%$%s%/%j%a%s%H1i;;;R(B | $B;;=Q1i;;;R(B |
z = ++y * 10;
|
1. y = y + 1;
2. z = y * 10;
|
z = y++ * 10;
|
1. z = y * 10;
2. y = y + 1;
|
$B
$B:F5"BeF~1i;;;R(B
$B:F5"BeF~1i;;;R(B
y = y + 10; | y += 10; |
y = y - 10; | y -= 10; |
y = y * 10; | y *= 10; |
y = y / 10; | y /= 10; |
y = y % 10; | y %= 10; |
y = y + 10;
$B$N$h$&$K!"1&JU$KI>2A$5$l$kJQ?t<+?H$,I=$l$k!":F5"E*BeF~J8$O!"%W%m%0%i%_%s%0$G$OIQ=P$G$9!#$=$N$?$a$N1i;;;R$H$7$F!"$3$3$G$O8^$D5s$2$^$7$?$,!"<+?H$,:.Mp$9$k$h$&$J$i$P;H$o$J$$J}$,NI$$$G$7$g$&!#(B
y += 10
$B$,(B y = y + 10
$B$@$H=q$-$^$7$?!#C1=c$J>l9g$O$=$N$^$^$J$N$G$9$,!"(B ++y += 10
$B$H$J$k$HOC$,0c$$$^$9!#(B
++y += 10; | ++y = ++y + 10; |
y = y + 1;
y = y + 10;
|
y = y + 1;
y = y + 1;
y = y + 10;
|
$BBeF~1i;;;R$N>l9g$O!"<0Cf$G0l2s$@$1$7$+I>2A$5$l$^$;$s!#$=$l$KBP$7$F!"E83+$7$?7A$N$b$N$O8=$l$?2s?tJ,$@$1I>2A$5$l$^$9!#(B
$BB>$N#29`1i;;;R$G$"$k%S%C%H1i;;$K$b!":F5"E*BeF~1i;;;R$,MQ0U$5$l$F$$$^$9$,!"$3$3$G$O>R2p$7$^$;$s!#(B
$B;09`1i;;;R(B ?:
$B:#$^$G$N1i;;;R$O!"1i;;BP>]$,0l$D$+Fs$D$G$7$?!#Nc$($P!"O@M}CM$NH]Dj1i;;;R(B !
$B$O0l9`$@$1$K1i;;$7$^$9!#>h;;1i;;;R(B *
$B$O1i;;BP>]$,:81&$K0l9`$:$DFs9`$"$j$^$9!#(B Java $B$G$O;09`$r1i;;BP>]$H$9$k1i;;;R$,B8:_$7$^$9!#$3$3$G>R2p$9$k;09`1i;;;R$O>r7o1i;;;R$H$b8F$P$l$^$9!#(B
y = a ? x1 : x2
a
$B$,??$G$"$l$P(B y = x1
$B$G$"$j!"56$G$"$l$P(B y = x2
$B$G$9!#(B
a
$B$O??56CM$,J,$+$k$b$N$G$J$1$l$P$J$j$^$;$s!#Nc$($P!"Hf3S1i;;<0(B i < 10
$B$rF~$l$k$3$H$,=PMh$^$9!#(B
a
$B$N??56$K$h$C$F!"(B y
$B$K$O(B x1
$B$+(B x2
$B$,BeF~$5$l$k$o$1$G$9$+$i!"(B x1
$B$H(B x2
$B$O(B y
$B$KBeF~$G$-$k$b$N$G$J$1$l$P$J$j$^$;$s!#(B
$B;09`1i;;;R$O!"J#?tAH$_9g$o$;$k;v$GJ#;(2x4q$K$J$b$N$,:n$l$k$N$G$9$,!"$3$3$G$O@bL@$7$^$;$s!#(B
$B%5%s%W%k(B
TestOperator.java
:
class TestOperator {
public static void main(String[] args) {
int x=10,y=3,z=0;
System.out.println("$B;;=Q1i;;;R(B");
System.out.println("x=" + x + " y=" + y);
System.out.println("x+y: " + (x + y));
System.out.println("x-y: " + (x - y));
System.out.println("x*y: " + (x * y));
System.out.println("x/y: " + (x / y));
System.out.println("x%y: " + (x % y));
}
}
C:\Java>javac TestOperator.java
C:\Java>java TestOperator
$B;;=Q1i;;;R(B
x=10 y=3
x+y: 13
x-y: 7
x*y: 30
x/y: 3
x%y: 1
class TestOperator {
public static void main(String[] args) {
int x=10,y=3,z=0;
System.out.println("$B:F5"E*BeF~J8(B");
System.out.println("x="+x+" y="+y);
System.out.print("x+=y:"+(x+=y));
System.out.println(" x="+x);
System.out.print("x*=y+10:"+(x*=y+10));
System.out.println(" x="+x);
System.out.println(" $B"((Bx=x*(y+10)$B$H2r
C:\Java>java TestOperator
$B:F5"E*BeF~J8(B
x=10 y=3
x+=y:13 x=13
x*=y+10:169 x=169
$B"((Bx=x*(y+10)$B$H2r
class TestOperator {
public static void main(String[] args) {
int x=10,y=3,z=0;
System.out.println("$B%$%s%/%j%a%s%H!?%G%/%j%a%s%H1i;;;R(B");
//$B8eCV%$%s%/%j%a%s%H1i;;;R(B
x=10;y=3;
System.out.println("x="+x+" y="+y);
z=y++*x;
System.out.print("1. z=y++*x: ");
System.out.println("z="+z+" y="+y);
//$BA0CV%$%s%/%j%a%s%H1i;;;R(B
x=10;y=3;
System.out.println("x="+x+" y="+y);
z=++y*x;
System.out.print("2. z=++y*x: ");
System.out.println("z="+z+" y="+y);
}
}
C:\Java>java TestOperator
$B%$%s%/%j%a%s%H!?%G%/%j%a%s%H1i;;;R(B
x=10 y=3
1. z=y++*x: z=30 y=4
x=10 y=3
2. z=++y*x: z=40 y=4
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