?? log.java
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package gep.num;import gep.Expression;import java.util.ArrayList;import java.util.List;/** * 自然對(duì)數(shù)函數(shù)表達(dá)式 */public class Log implements NExpression{ public static final char code = 'L'; public static final int arity = 1; private NExpression left; public char getCode() { return code; } public int getArity() { return arity; } public void addChild(Expression child) { if (left==null) { left = (NExpression) child; return; } throw new IllegalStateException("ADD_CHILD_ERROR"); } public double evaluate() { double answer = Math.log(left.evaluate()); if (Double.isNaN(answer)) throw new RuntimeException("error on log"); return answer; } public String toString() { return "Log[" + left + "]"; } public List getChildren() { List children = new ArrayList(); children.add(left); return children; }}
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