public void BasicOperations()
{
ExpressionCalculator expression = new ExpressionCalculator();
expression.GetResult("2+3").Should().Be(2d + 3d);
expression.GetResult("2-3").Should().Be(2d - 3d);
expression.GetResult("2*3").Should().Be(2d * 3d);
expression.GetResult("5/2").Should().Be(5d / 2d);
expression.GetResult("2^3").Should().Be(Math.Pow(2, 3));
Math.Round(expression.GetResult("2r3"), 5).Should().Be(Math.Round(Math.Exp(Math.Log(2, Math.E) / 3), 5)); //round because double precision limit
Math.Round(expression.GetResult("2r3"), 6).Should().Be(Math.Round(Math.Pow(2d, 1d / 3d), 6)); //round because double precision limit
Math.Round(expression.GetResult("2l3"), 6).Should().Be(Math.Round(Math.Log(2d, 3d), 6)); //round because double precision limit
}
public void TestOperatorsOrder()
{
ExpressionCalculator expression = new ExpressionCalculator();
expression.GetResult("9+8-7*6/5^4r3l2").Should().Be(expression.GetResult("9+8-7*6/(5^4r3l2)"));
expression.GetResult("9+8-7*6/5^4r3l2").Should().Be(expression.GetResult("9+8-7*6/((5^4)r3l2)"));
expression.GetResult("9+8-7*6/5^4r3l2").Should().Be(expression.GetResult("9+8-7*6/(((5^4)r3)l2)"));
expression.GetResult("9+8-7*6/5^4r3l2").Should().Be(expression.GetResult("9+8-7*(6/(((5^4)r3)l2))"));
expression.GetResult("9+8-7*6/5^4r3l2").Should().Be(expression.GetResult("9+8-(7*(6/(((5^4)r3)l2)))"));
expression.GetResult("9+8-7*6/5^4r3l2").Should().Be(expression.GetResult("9+(8-(7*(6/(((5^4)r3)l2))))"));
}
public void TestsBrakets()
{
ExpressionCalculator expression = new ExpressionCalculator();
expression.GetResult("((2+3)*(6+5))/2").Should().Be(((2d + 3d) * (6d + 5d)) / 2d);
}
