22 lines
586 B
Java
22 lines
586 B
Java
class ArithmeticNode extends BinaryNode {
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ArithmeticNode(String aOp, ExpressionNode aLeft, ExpressionNode aRight)
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{
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super(aOp, aLeft, aRight);
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}
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void eval(Environment theEnv)
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{
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super.eval(theEnv);
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double dR = theEnv.theStack.pop().d;
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double dL = theEnv.theStack.pop().d;
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if (op == "+")
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theEnv.theStack.push(new StackValue(dL + dR));
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else
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if (op == "-")
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theEnv.theStack.push(new StackValue(dL - dR));
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else
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System.out.println("missing arithmetic op " + op);
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}
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} |