public CalculatorService(IEnumerable <ICalcOperation> calcOperation, IColorOperation colorOperation)
 {
     this.calcOperations = calcOperation;
     this.colorOperation = colorOperation;
 }
 public CalculatorService()
 {
     calcOperations = new ICalcOperation[] { new AddOperation(), new SubOperation(), new MulOperation(), new DivOperation() };
     colorOperation = new ColorOperation();
 }