How to write a Calculater Program by using dependency in C#?

You can either create it as a class library and directly reference to your UI app (console/web) or you can create a class file and use dependency injection by resgistering it inside Main() in .NET 6 or in startup.cs in .NET 5 downwards.

public interface ICalculator
{
double Calculate(double num1,double num2, string operator);
}

public class Calculator:ICalculator
{
public double Calculate(double num1, double num2, string operand)
{
double ansewer=0;
switch (operand)
{
case "-":
answer = num1 - num2;
break;
case "+":
answer = num1 + num2;
break;
case "/":
answer = num1 / num2;
break;
case "*":
answer = num1 * num2;
break;
default:
answer = 0;
break;
}
return answer;
}
}

startp.cs

public void ConfigureServices(IServiceCollection services)
{
//
services.AddTransient();
}

UI layer

public class controller:BaseController
{
private ICalculator _cal;
public controller(ICalculator cal)
{
_cal=cal;
}
public double MyCalc(int a, int b)
{
return _cal.Calculate(a,b,"+");
}
}

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Gajendra Jangid4y ago
Accepted answer
Use this link
https://codereview.stackexchange.com/questions/123599/tiny-calculator-using-dependency-injection-and-inversion-of-control
sree sree4y ago
Thank you Sachin Singh ji for solving my Query
Rajeesh Menoth4y ago
Hi,

Please go through the following reference :

https://codereview.stackexchange.com/questions/123599/tiny-calculator-using-dependency-injection-and-inversion-of-control
Sachin Singh4y ago
You can either create it as a class library and directly reference to your UI app (console/web) or you can create a class file and use dependency injection by resgistering it inside Main() in .NET 6 or in startup.cs in .NET 5 downwards.
public interface ICalculator
{
double Calculate(double num1,double num2, string operator);
}
public class Calculator:ICalculator
{
public double Calculate(double num1, double num2, string operand)
{
double ansewer=0;
switch (operand)
                {
                    case "-":
                        answer = num1 - num2;
                        break;
                    case "+":
                        answer = num1 + num2;
                        break;
                    case "/":
                        answer = num1 / num2;
                        break;
                    case "*":
                        answer = num1 * num2;
                        break;
                    default:
                        answer = 0;
                        break;
                }
return answer;
}
}
startp.cs
public void ConfigureServices(IServiceCollection services)
{
   //

     services.AddTransient();

}
UI layer
public class controller:BaseController
{
private ICalculator _cal;
public controller(ICalculator cal)
{
_cal=cal;
}
public double MyCalc(int a, int b)
{
return _cal.Calculate(a,b,"+");
}
}