File: BinaryOperatorAST.java

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public abstract class BinaryOperatorAST extends CalcAST {
	public CalcAST left() {
		return (CalcAST)getFirstChild();
	}

	public CalcAST right() {
		CalcAST t = left();
		if ( t==null ) return null;
		return (CalcAST)t.getNextSibling();
	}
}