表达式计算源码JAVA实现.doc

支持运算符:+-*/%><][!|&=;其中]表示大于等于、[表示小于等于、!表示不等于、|表示或、&表示与、=表示是否等于
支持函数:sqrt,square, ceil,sin,cos,asin,,log,exp具体含义见calFunction代码
表达式计算组件源码:
import ;
import .*;
public class BaseExpression {
  public static String OPTS = "+-*/%><][!|&=#";
  public Object calculate(String expression)  throws ExpressionException{
    try
    {
    Stack Opts = new Stack();
    Stack Values = new Stack();
    String exp = expression + "#";
    int nCount = (), nIn, nOut, nTemp;
    ("#");
    String temp = "", optOut = "", optIn = "", value1 = "", value2 = "",
        optTemp = "", opt = "", temp1 = "";
    int nFun = 0;
    boolean isFun = false;
    for (int i = 0; i < nCount; ) {
      nTemp = 0;
      opt = (i, i + 1);
      isFun = false;
      temp1 = "";
      while (i < nCount) {
        if (!("")) {
          if (("(")) {
            nFun++;
            isFun = true;
          }
          else if ((")")) {
            nFun--;
          }
        }
        if ( (nFun > 0) || ( (!isFun) && (opt))) {
          temp1 += opt;
          nTemp++;
          opt = (i + nTemp, i + nTemp + 1);
        }
        else {
          if (isFun) {
            temp1 += opt;
            nTemp++;
          }
          break;
        }