AK.ExpressionSolverTests.TestFuncs C# (CSharp) Method

        public static void TestFuncs()
        {
            ExpressionSolver solver = new ExpressionSolver();
            solver.SetGlobalVariable("zero",0);
            var exp1 = solver.SymbolicateExpression("sin(pi/2)-cos(zero)");
            AssertSameValue(exp1.Evaluate(),0);
            var exp2 = solver.SymbolicateExpression("2*e^zero - exp(zero)");
            AssertSameValue(exp2.Evaluate(),1);
            var exp3 = solver.SymbolicateExpression("log(e^6)");
            AssertSameValue(exp3.Evaluate(),6);
            var exp4 = solver.SymbolicateExpression("sqrt(2)-2^0.5");
            AssertSameValue(exp4.Evaluate(),0);
            var exp5 = solver.SymbolicateExpression("exp(log(6))");
            AssertSameValue(exp5.Evaluate(),6);
            var rnd = new System.Random();
            solver.AddCustomFunction("Rnd1",2, delegate(double[] p) {
                return p[0] + (p[1]-p[0])*(rnd.NextDouble());
            },false);
            var exp6 = solver.SymbolicateExpression("Rnd1(0,1)");
            var firstRnd = exp6.Evaluate();
            int iter = 0;
            while (true)
            {
                var secondRnd = exp6.Evaluate();
                if (firstRnd != secondRnd)
                {
                    break;
                }
                iter++;
                if (iter==10000)
                {
                    // Probability of this happening is miniscule if everything works as it should
                    throw new System.Exception("ExpressionSolverTest failed");
                }
            }
            solver.AddCustomFunction("Rnd2",2, delegate(double[] p) {
                return p[0] + (p[1]-p[0])*(rnd.NextDouble());
            },true);
            var exp7 = solver.SymbolicateExpression("Rnd2(0,1)");
            AssertSameValue(exp7.Evaluate(),exp7.Evaluate());
            var exp8 = solver.SymbolicateExpression("cos(0)+1*2");
            AssertSameValue(exp8.Evaluate(),3);
            solver.AddCustomFunction("dist",5, delegate(double[] p) {
                return System.Math.Pow( (p[2]-p[0])*(p[2]-p[0]) + (p[3]-p[1])*(p[3]-p[1])    ,p[4]);
            },true);
            var exp9 = solver.SymbolicateExpression("dist(3*x,(4*x),+6*x,-1*x,sin(x))","x");
            double x = 21;
            exp9.SetVariable("x",x);
            AssertSameValue(exp9.Evaluate(),System.Math.Pow( (3*x-6*x)*(3*x-6*x)+(4*x+x)*(4*x+x),System.Math.Sin(x)  ));
        }