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s = "2. 5. SWAP -"; assertEquals ("expression: " + s, 3., DoubleStack.interpret (s), delta); s = "3. DUP *"; assertEquals ("expression: " + s, 9., DoubleStack.interpret (s), delta); s = "2. 5. 9. ROT - +"; assertEquals ("expression: " + s, 12., DoubleStack.interpret (s), delta); s = "-3. -5. -7. ROT - SWAP DUP * +"; assertEquals ("expression: " + s, 21., DoubleStack.interpret (s), delta);
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