Revised: Dec./30th/2001: Since: Dec./30th/2001
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ax^2 + bx + c = 0
$B%3%^%s%I%i%$%s0z?t$+$i!"(B a, b, c $B$r
-b ± D
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$B$,@k8@$5$l$?(B main()
$B%a%=%C%I$+$iMxMQ$7$^$9$+$i!"$3$N2r$N7W;;%a%=%C%I$b(B static
$B$K$7$F$*$/I,MW$,$"$j$^$9!#(B
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KaiTest.java
:
class KaiTest { public static void main(String[] args) { System.out.print(args[0] + "x*x + "); System.out.print(args[1] + "x + "); System.out.println(args[2]); //$B0z?t$r(B double $B7?$KJQ49(B double a = Double.parseDouble(args[0]); double b = Double.parseDouble(args[1]); double c = Double.parseDouble(args[2]); //$B%a%=%C%I$NLa$jCM$rG[Ns$GDj5A(B double[] x; //$B%a%=%C%I8F$S=P$7(B x = koushiki(a,b,c); System.out.println("\t$B2r(B x1 = " + x[0]); System.out.println("\t$B2r(B x2 = " + x[1]); } static double[] koushiki(double a, double b, double c) { //$B2r$NG[Ns$rDj5A(B double[] x = {0,0}; //$BH=JL<0$NJQ?t$rDj5A(B double d2=0, d=0; //$BH=JL<0(B d2 = b*b - 4*a*c; if (d2 < 0) { //$B5u?t2r$J$i$P(B System.out.println("$B5u?t2r!*(B $BH=JL<0(B = " + d2); } else { //$B} }
$B%3%^%s%I%i%$%s0z?t(B args[0]
- args[2]
$B$O(B$BJ8;zNs7?(B$B$H$7$FDj5A$5$l$F$$$^$9$,!"(B Double
$B%/%i%9(B$B$N(B$B@EE*%a%=%C%I(B parseDouble()
$B$rMQ$$$F(B double
$B7?$K7?JQ49$7$F$$$^$9!#$3$&$9$k$3$H$G!";MB'1i;;$,2DG=$K$J$j$^$9!#0lHL$K!"B>$N%Q%C%1!<%8$N%/%i%9$rMxMQ$9$k>l9g$O(B$B%$%s%]!<%H(B$B$9$kI,MW$,$"$j$^$9$,!"(B java.lang
$B%Q%C%1!<%8$K4^$^$l$k%/%i%9$O!"(B javac
$B$K$h$C$F%3%s%Q%$%k$5$l$k$H$-$K!"A4$F<+F0E*$K%$%s%]!<%H$5$l$^$9$N$G!"L@<(E*$K%$%s%]!<%H$9$kI,MW$O$"$j$^$;$s!#(B
$B2r$N8x<07W;;$N$?$a$N(B$B%a%=%C%I(B koushiki()
$B!'(B
static | $B@EE*%a%=%C%I!#(B main() $B%a%=%C%I$O@EE*%a%=%C%I$G$"$j!"@EE*%a%=%C%I$+$i$O@EE*%a%=%C%I$7$+MxMQ$G$-$J$$!#(B |
double[] | $BLa$jCM$O(B double $B7?(B$B$N(B$BG[Ns(B$B!#(B |
koushiki(...) | $B%a%=%C%IL>$H0z?t$NDj5A!#$3$N%a%=%C%I$O;0$D$N(B double $B7?$N%j%F%i%k$r0z?t$H$7$F
|
{...} | $B%a%=%C%I$Nreturn $BJ8(B$B$G8F$S=P$785$K@)8f$rLa$9!#(B |
$B$3$N%a%=%C%I$NFbIt$G$O!"H=JL<0$r7W;;$7!"IiCM$J$i$P@)8f$rLa$7!"#00J>e$NCM$J$i$P2r$N8x<0$r7W;;$7$F!"@)8f$rLa$7$^$9!#H=JL<0$NJ?J}:,$r7W;;$9$k$N$K!"(B$B%3%"%Q%C%1!<%8(B java.lang
$B$N(B Math
$B%/%i%9$GDj5A$5$l$?@EE*%a%=%C%I(B sqrt()
$B$rMQ$$$F$$$^$9!#$3$N%/%i%9$O(B Double
$B%/%i%9$d(B String
$B%/%i%9$HF1MM$K(B java.lang
$B%Q%C%1!<%8$K4^$^$l$F$$$k$N$G!"L@<(E*$J%$%s%]!<%H$OI,MW$"$j$^$;$s!#(B
C:\Java>javac KaiTest.java C:\Java>java KaiTest 1 -2 -3 1x*x + -2x + -3 $B2r(B x1 = 3.0 $B2r(B x2 = -1.0 C:\Java>java KaiTest 1 -2 3 1x*x + -2x + 3 $B5u?t2r!*(B $BH=JL<0(B = -8.0 $B2r(B x1 = 0.0 $B2r(B x2 = 0.0
$B
$B%/%i%9(B Kai
$B!'(B
$B$3$3$G$O!"$3$N$h$&$JH/A[$G%3!<%G%#%s%0$7$^$9!#$3$N%/%i%9$rMxMQ$9$k(B main()
$B%a%=%C%I$O!"(B KaiTest2
$B%/%i%9$K:n$j$^$9!#(B
KaiTest2.java
:
//$BMxMQ$5$l$kFs//$B%3%s%9%H%i%/%?(B //ax^2 + bx +c = 0 Kai(double a , double b, double c) { this.a = a; this.b = b; this.c = c; } //$B2r$N8x<07W;;(B public double calKai() { //$BH=JL<0$NJQ?t$rDj5A(B double d2 = 0, d = 0; //$BH=JL<0(B d2 = b*b - 4*a*c; if (d2 >= 0) { //$BH=JL<0$,@5$+#0$J$i$P(B d = Math.sqrt(d2); kai[0] = (-b + d)/(2*a); //$B2r#1(B kai[1] = (-b - d)/(2*a); //$B2r#2(B } return d2; } //$B2r$rF@$k(B public double[] getKai() { return kai; } } //Kai $B%/%i%9$NMxMQ(B class KaiTest2 { public static void main(String[] args) { System.out.print(args[0] + "x*x + "); System.out.print(args[1] + "x + "); System.out.println(args[2]); //$B0z?t$r(B double $B7?$KJQ49(B double a = Double.parseDouble(args[0]); double b = Double.parseDouble(args[1]); double c = Double.parseDouble(args[2]); //$B2r$NG[Ns(B double[] x = {0,0}; //$B2r$N8x<07W;;$NLa$jCM(B double d2; //$B%$%s%9%?%s%92=(B Kai obj = new Kai(a,b,c); //$B2r$N8x<0$r7W;;$9$k(B d2 = obj.calKai(); if (d2 >= 0) { //$BLa$jCM$,(B 0 $B0J>e$J$i$P(B //$B2r$rF@$k(B x = obj.getKai(); if (d2 > 0) { System.out.println("\t $B2r(B x1 = " + x[0]); System.out.println("\t $B2r(B x2 = " + x[1]); } else { System.out.println("$B=E2r(B"); System.out.println("\t x1 = x2 = " + x[0]); } } else { //$BLa$jCM$,Ii$J$i$P(B System.out.println("$B5u?t2r!*(B $BH=JL<0(B = " + d2); } } }
C:\Java>javac KaiTest2.java C:\Java>java KaiTest2 1 -2 -3 1x*x + -2x + -3 $B2r(B x1 = 3.0 $B2r(B x2 = -1.0 C:\Java>java KaiTest2 1 -2 1 1x*x + -2x + 1 $B=E2r(B x1 = x2 = 1.0 C:\Java>java KaiTest2 1 -2 3 1x*x + -2x + 3 $B5u?t2r!*(B $BH=JL<0(B = -8.0
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