java eval
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¼ÆËã.µ±È»Ò²¿ÉÒÔÖ±½Ó¼ÆËãÖÐ׺±í´ïʽ,¿¼Âǵ½Òª¶àλÊý,¾ÍûÄÇô×ö.
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Java
´úÂë
package
edu.jlu.fuliang;
import
java
.util.ArrayList;
import
java
.util.List;
import
java
.util.Stack;
public
class
Eval
{
public
int
eval
(String exp){
List<String> list = infixExpToPostExp(exp);//ת»¯³Éºó׺±í´ïʽ
return
doEval(list);
//ÕæÕýÇóÖµ
}
//Óöµ½²Ù×÷·ûѹջ£¬Óöµ½±í´ïʽ´Óºó׺±í´ïʽÖе¯³öÁ½¸öÊý£¬¼ÆËã³ö½á¹û£¬Ñ¹Èë¶ÑÕ»
private
int
doEval(List<String> list) {
Stack<String> stack = new
Stack<String>();
String element;
int
n1,n2,result;
try
{
for
(
int
i =
0
; i < list.size();i++){
element = list.get(i);
if
(isOperator(element)){
n1 = Integer.parseInt(stack.pop());
&nb
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