How to enable error raising for invalid operations.

ID: 406

See: TrapOnInvalid = [bool] 
				
					using uCalcSoftware;

var uc = new uCalc();
// By default, invalid operations return 'nan'
Console.WriteLine(uc.EvalStr("sqrt(-1)"));

// Enable error raising for this specific case
uc.Error.TrapOnInvalid = true;

// Now, the same operation returns a descriptive error message
Console.WriteLine(uc.EvalStr("sqrt(-1)"));
				
			
nan
Invalid operation
Explore 600+ other examples
				
					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   // By default, invalid operations return 'nan'
   cout << uc.EvalStr("sqrt(-1)") << endl;

   // Enable error raising for this specific case
   uc.Error().TrapOnInvalid(true);

   // Now, the same operation returns a descriptive error message
   cout << uc.EvalStr("sqrt(-1)") << endl;
}
				
			
nan
Invalid operation
Explore 600+ other examples
				
					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      '// By default, invalid operations return 'nan'
      Console.WriteLine(uc.EvalStr("sqrt(-1)"))
      
      '// Enable error raising for this specific case
      uc.Error.TrapOnInvalid = true
      
      '// Now, the same operation returns a descriptive error message
      Console.WriteLine(uc.EvalStr("sqrt(-1)"))
   End Sub
End Module
				
			
nan
Invalid operation
Explore 600+ other examples