Package com.marakana.calculator.expressions

Examples of com.marakana.calculator.expressions.NumberExpression

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  public static boolean handleNumber(String token, Stack<Expression> stack) {
    // try-catch to distinguish numbers from non-numbers
    try {
      int number = Integer.parseInt(token);
      stack.push(new NumberExpression(number));
      return true;
    } catch (NumberFormatException e) {
      return false;
    }
  }
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  @Test
  public void handleNumberMustPushNumber() {
    Stack<Expression> stack = new Stack<Expression>();
    assertTrue(Calculator.handleNumber("5", stack));
    assertEquals(new NumberExpression(5), stack.pop());
  }
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  }

  @Test
  public void handleOperatorMustPerformOperation() {
    Stack<Expression> stack = new Stack<Expression>();
    stack.push(new NumberExpression(3));
    stack.push(new NumberExpression(4));
    assertTrue(Calculator.handleOperator("*", stack));
    assertEquals(new OperationExpression(Operator.MULTIPLY,
        new NumberExpression(3), new NumberExpression(4)), stack.pop());
  }
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Related Classes of com.marakana.calculator.expressions.NumberExpression

  • com.marakana.calculator.Calculator
  • com.marakana.calculator.test.CalculatorTest
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