Automatic Math Sum Solver - C#

Question

Hi, How do I write code for a c# app in such a way that it automatically simplifies a given math problem? Like for example, can it automatically simplify 9(6-3) which is 54 - 27 = 27 so that I don't have to manually provide the code saying

 if(operator == "-")
{
first - second;
}
else if(operator == "+")
{
first + second;
}

and so on. Instead I just provide "simply(userprovidedvalue)". How do I do that? Is there any way?

Answer 1

Maybe you can use the MS Script control, like :

var scriptType = Type.GetTypeFromCLSID(Guid.Parse("0E59F1D5-1FBE-11D0-8FF2-00A0D10038BC"));
dynamic sc = Activator.CreateInstance(scriptType);
sc.Language = "VBScript"; 
string sExpression = "9*(6-3)";
// or for example
// sc.ExecuteStatement("a = 9");
// sc.ExecuteStatement("b = 6");
// sc.ExecuteStatement("c = 3");
// string sExpression = "a*(b-c)";
object objResult = null;
try
{
    objResult = sc.Eval(sExpression);
}
catch (System.Exception ex)
{
    MessageBox.Show("Error: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    return;
}
MessageBox.Show(objResult.ToString());

Answer 2

I feel that your requirements are like expression trees. Is this what you want?

This is an expression to calculate the Pythagorean Theorem.

        static void Main(string[] args)  
        {  
            LambdaExpression lambdaExpression = GetExpression();  
            var re=  lambdaExpression.Compile().DynamicInvoke(3, 4);  
            Console.WriteLine(re);  
            Console.ReadLine();  
        }  
        public static LambdaExpression GetExpression()  
        {  
            var xParameter = Expression.Parameter(typeof(double), "x");  
            var yParameter = Expression.Parameter(typeof(double), "y");  
  
            var xSquared = Expression.Multiply(xParameter, xParameter);  
            var ySquared = Expression.Multiply(yParameter, yParameter);  
  
            var sum = Expression.Add(xSquared, ySquared);  
            var sqrtMethod = typeof(Math).GetMethod("Sqrt", new[] { typeof(double) });  
            var distance = Expression.Call(sqrtMethod, sum);  
  
            var distanceLambda = Expression.Lambda(  
                            distance,  
                            xParameter,  
                            yParameter);  
            return distanceLambda;  
        }  

Hope I did not misunderstand what you mean.

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