?? 後序式的運算.mht
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Date: Wed, 13 Sep 2006 01:17:29 +0800
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<H3><A=20
href=3D"http://caterpillar.onlyfun.net/Gossip/index.html">http://caterpil=
lar.onlyfun.net/Gossip/index.html</A></H3>
<H1><A=20
href=3D"http://www.java3z.com/cwbwebhome/article/article3/AlgorithmGossip=
/AlgorithmGossip.htm">Algorithm=20
Gossip: =AB=E1=A7=C7=A6=A1=AA=BA=B9B=BA=E2</A></H1>=BB=A1=A9=FA=B1N =
<A class=3Dwikilink=20
href=3D"http://www.java3z.com/cwbwebhome/article/article3/AlgorithmGossip=
/InFixPostfix.htm">=A4=A4=A7=C7=A6=A1=C2=E0=B4=AB=AC=B0=AB=E1=A7=C7=A6=A1=
</A>=20
=AA=BA=A6n=B3B=ACO=A1A=A4=A3=A5=CE=B3B=B2z=B9B=BA=E2=A4l=A5=FD=AB=E1=B6=B6=
=A7=C7=B0=DD=C3D=A1A=A5u=ADn=A8=CC=A7=C7=A5=D1=B9B=BA=E2=A6=A1=A5=D1=ABe=A9=
=B9=AB=E1=C5=AA=A8=FA=A7Y=A5i=A1C=20
<H2>=B8=D1=AAk</H2>=B9B=BA=E2=AE=C9=A5=D1=AB=E1=A7=C7=A6=A1=AA=BA=ABe=A4=E8=
=B6}=A9l=C5=AA=A8=FA=A1A=B9J=A8=EC=B9B=BA=E2=A4=B8=A5=FD=A6s=A4J=B0=EF=C5=
|=A1A=A6p=AAG=B9J=A8=EC=B9B=BA=E2=A4l=A1A=ABh=A5=D1=B0=EF=C5|=A4=A4=A8=FA=
=A5X=A8=E2=AD=D3=B9B=BA=E2=A4=B8=B6i=A6=E6=B9=EF=C0=B3=AA=BA=B9B=BA=E2=A1=
A=B5M=AB=E1=B1N=B5=B2=AAG=A6s=A6^=B0=EF=C5|=A1A=A6p=AAG=B9B=BA=E2=A6=A1=C5=
=AA=A8=FA=A7=B9=B2=A6=A1A=A8=BA=BB=F2=B0=EF=C5|=B3=BB=AA=BA=AD=C8=B4N=ACO=
=B5=AA=AE=D7=A4F=A1A=A8=D2=A6p=A7=DA=AD=CC=ADp=BA=E212+34+*=B3o=AD=D3=B9B=
=BA=E2=A6=A1=A1]=A4]=B4N=ACO(1+2)*(3+4)=A1^=A1G=20
<TABLE width=3D"50%" border=3D1>
<TBODY>
<TR>
<TD vAlign=3Dtop align=3Dleft><SMALL>=C5=AA=A8=FA </SMALL></TD>
<TD vAlign=3Dtop align=3Dleft><SMALL>=B0=EF=C5| </SMALL></TD></TR>
<TR>
<TD vAlign=3Dtop align=3Dleft><SMALL>1 </SMALL></TD>
<TD vAlign=3Dtop align=3Dleft><SMALL>1 </SMALL></TD></TR>
<TR>
<TD vAlign=3Dtop align=3Dleft><SMALL>2 </SMALL></TD>
<TD vAlign=3Dtop align=3Dleft><SMALL>1 2 </SMALL></TD></TR>
<TR>
<TD vAlign=3Dtop align=3Dleft><SMALL>+ </SMALL></TD>
<TD vAlign=3Dtop align=3Dleft><SMALL>3 // 1+2 =AB=E1=A6s=A6^ =
</SMALL></TD></TR>
<TR>
<TD vAlign=3Dtop align=3Dleft><SMALL>3 </SMALL></TD>
<TD vAlign=3Dtop align=3Dleft><SMALL>3 3 </SMALL></TD></TR>
<TR>
<TD vAlign=3Dtop align=3Dleft><SMALL>4 </SMALL></TD>
<TD vAlign=3Dtop align=3Dleft><SMALL>3 3 4 </SMALL></TD></TR>
<TR>
<TD vAlign=3Dtop align=3Dleft><SMALL>+ </SMALL></TD>
<TD vAlign=3Dtop align=3Dleft><SMALL>3 7 // 3+4 =AB=E1=A6s=A6^ =
</SMALL></TD></TR>
<TR>
<TD vAlign=3Dtop align=3Dleft><SMALL>* </SMALL></TD>
<TD vAlign=3Dtop align=3Dleft><SMALL>21 // 3 * 7=20
=AB=E1=A6s=A6^</SMALL></TD></TR></TBODY></TABLE><BR>
<H2>=B9=EA=A7@</H2>
<UL>
<LI>C </LI></UL><PRE>#include <stdio.h> <BR>#include =
<stdlib.h> <BR><BR>void evalPf(char*); <BR>double cal(double, =
char, double); <BR><BR>int main(void) { <BR> char input[80]; <BR><BR> =
printf("=BF=E9=A4J=AB=E1=A7=C7=A6=A1=A1G"); <BR> scanf("%s", =
input); <BR> evalPf(input); <BR><BR> return; <BR>} <BR><BR>void =
evalPf(char* postfix) { <BR> double stack[80] =3D {0.0}; <BR> char =
temp[2]; <BR> char token; <BR> int top =3D 0, i =3D 0; <BR><BR> =
temp[1] =3D '\0'; <BR><BR> while(1) { <BR> token =3D =
postfix[i]; <BR> switch(token) { <BR> case '\0': <BR> =
printf("ans =3D %f\n", stack[top]); <BR> =
return; <BR> case '+': case '-': case '*': case '/': <BR> =
stack[top-1] =3D <BR> cal(stack[top], =
token, stack[top-1]); <BR> top--; <BR> =
break; <BR> default: <BR> if(top < =
sizeof(stack) / sizeof(float)) { <BR> temp[0] =3D =
postfix[i]; <BR> top++; <BR> =
stack[top] =3D atof(temp); <BR> } <BR> =
break; <BR> } <BR> i++; <BR> } <BR>} <BR><BR>double =
cal(double p1, char op, double p2) { <BR> switch(op) { <BR> =
case '+': <BR> return p1 + p2; <BR> case '-': <BR> =
return p1 - p2; <BR> case '*': <BR> return p1 * =
p2; <BR> case '/': <BR> return p1 / p2; <BR> } =
<BR>} <BR></PRE><BR>
<UL>
<LI>Java </LI></UL><PRE>public class InFix {<BR> private static int =
priority(char op) { <BR> switch(op) { <BR> case '+': =
case '-': <BR> return 1; <BR> case '*': case =
'/': <BR> return 2;<BR> default: <BR> =
return 0;<BR> } <BR> }<BR> <BR> public static =
char[] toPosfix(char[] infix) {<BR> char[] stack =3D new =
char[infix.length]; <BR> char[] postfix =3D new =
char[infix.length];<BR> char op; <BR><BR> StringBuffer =
buffer =3D new StringBuffer();<BR><BR> int top =3D 0;<BR> =
for(int i =3D 0; i < infix.length; i++) { <BR> op =3D =
infix[i]; <BR> switch(op) { <BR> // =
=B9B=BA=E2=A4l=B0=EF=C5| <BR> case '(': <BR> =
if(top < stack.length) { <BR> top++; =
<BR> stack[top] =3D op; <BR> } =
<BR> break; <BR> case '+': case '-': =
case '*': case '/': <BR> while(priority(stack[top]) =
>=3D <BR> priority(op)) { <BR> =
buffer.append(stack[top]);<BR> top--; =
<BR> } <BR> // =A6s=A4J=B0=EF=C5| =
<BR> if(top < stack.length) { <BR> =
top++; <BR> stack[top] =3D op; <BR> =
} <BR> break; <BR> // =B9J =
) =BF=E9=A5X=A6=DC ( <BR> case ')': <BR> =
while(stack[top] !=3D '(') { <BR> =
buffer.append(stack[top]);<BR> top--; <BR> =
} <BR> top--; // =A4=A3=BF=E9=A5X( <BR> =
break; <BR> // =
=B9B=BA=E2=A4=B8=AA=BD=B1=B5=BF=E9=A5X <BR> default: <BR> =
buffer.append(op);<BR> break; <BR> =
} <BR> } <BR> <BR> while(top > 0) { =
<BR> buffer.append(stack[top]);<BR> top--; <BR> =
}<BR> <BR> return buffer.toString().toCharArray();<BR> =
}<BR><BR> private static double cal(double p1, char op, double p2) =
{ <BR> switch(op) { <BR> case '+': <BR> =
return p1 + p2; <BR> case '-': <BR> return p1 =
- p2; <BR> case '*': <BR> return p1 * p2; <BR> =
case '/': <BR> return p1 / p2; <BR> =
}<BR> return 0.0;<BR> }<BR> <BR> public static double =
eval(char[] postfix) {<BR> double[] stack =3D new =
double[postfix.length]; <BR> char token; <BR> int top =3D =
0; <BR><BR> for(int i =3D 0; i < postfix.length; i++) { <BR> =
token =3D postfix[i]; <BR> switch(token) { <BR> =
case '+': case '-': case '*': case '/': <BR> =
stack[top-1] =3D <BR> cal(stack[top], token, =
stack[top-1]); <BR> top--; <BR> =
break; <BR> default: <BR> if(top < =
stack.length) { <BR> char temp =3D postfix[i]; =
<BR> top++; <BR> =
stack[top] =3D <BR> Double.parseDouble(<BR> =
String.valueOf(temp)); <BR> =
} <BR> break; <BR> } <BR> } =
<BR><BR> return stack[top];<BR> }<BR> <BR> public static =
void main(String[] args) {<BR> String infix =3D =
"(1+2)*(3+4)";<BR> <BR> System.out.println(InFix.eval(<BR> =
InFix.toPosfix(infix.toCharArray())));<BR> =
}<BR>}</PRE><BR><BR></BODY></HTML>
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