public static IStrategy FindStrategy(char @operator)
{
IStrategy strategyToChange = null;
switch (@operator)
{
case '+':
strategyToChange = new AdditionStrategy();
break;
case '-':
strategyToChange = new SubtractionStrategy();
break;
case '*':
strategyToChange = new MultiplicationStrategy();
break;
case '/':
strategyToChange = new DivisionStrategy();
break;
default:
throw new ArgumentException($"Invalid operator {@operator} !");
}
return(strategyToChange);
}
public PrimitiveCalculator()
{
this.additionStrategy = new AdditionStrategy();
this.subtractionStrategy = new SubtractionStrategy();
this.multiplicationStrategy = new MultiplicationStrategy();
this.divisionStrategy = new DivisionStrategy();
this.isAddition = true;
}