using org.mariuszgromada.math.mxparser;

using System;

​

public static class TestMXParser 

{

    public static void Main()

    {

        string formula = "if(((x > -60)&& (x< -40)) || ((x > -31)&&(x < 4)), 1.2, 0.2)";    

        //string formula = "if((x < -60) || ((x < -31)&&(x > -40)) || (x >= 4), 0.2, 1.2)"; 

                         //"iff( ((X<-60)||(X>-40)) & ((X<-31)||(X>4)), 0.2; ((X>=-60)&(X<=-40)) || ((X>=-31)&(X<=4)), 1.2)"

        double oldanswer = double.NaN;

        for (int x = -90; x <= 90; x++)

        {

            Argument a = new Argument($"x = {x}");

            Expression e = new Expression(formula,a);

            var answer = e.calculate();

            if (oldanswer != answer)

            {

                Console.WriteLine(a.getArgumentValue() + " = " + e.getExpressionString() + " = " + answer);

                oldanswer = answer;

            }

        }

    }

}

​