SubNode.java

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package com.graphbuilder.math;

public class SubNode extends OpNode {

    public SubNode(Expression leftChild, Expression rightChild) {
        super(leftChild, rightChild);
    }

    public double eval(VarMap v, FuncMap f) {
        double a = leftChild.eval(v, f);
        double b = rightChild.eval(v, f);
        return a - b;
    }

    public String getSymbol() {
        return "-";
    }
}