math-interpreter

Well as the title says, this is a simple math interpreter. For now, you can use:

• Decimal numbers and integer numbers
• Functions:
  • tan
  • sin
  • cos
  • sqrt
• Unary Operators:
  • plus (+)
  • minus (-)
• Binary Operators:
  • multiply (*)
  • divide (/)
  • minus (-)
  • plus (+)
  • pow (^)
• Group by parentheses: ()

A few examples:

    @Test
    public void evaluateMultipleOperations() throws Exception {
        Assert.assertEquals(new Evaluator().evaluate("sqrt(3 * 3) + sqrt(3 * 3)"), 6D, DELTA);
    }

    @Test
    public void evaluateMultipleGroupedOperations() throws Exception {
        Assert.assertEquals(new Evaluator().evaluate("(sqrt(3 * 3) + sqrt(3 * 3)) * 2"), 12D, DELTA);
    }
    
    @Test
    public void evaluateMultipleGroupedOperationsWithUnaryOperator() throws Exception {
        Assert.assertEquals(new Evaluator().evaluate("((4 - 2^3 + 1) * -sqrt(3*3 + (sqrt(3*3)+13))) + 2"), 17D, DELTA);
    }