Interface, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    interface Iinterface1
    {
        int addition(int a,int b);
        int sub(int a,int b);
    }
    interface Iinterface2
    {
        int mul(int a,int b);
        int div(int a,int b);
    }
    
    public class Class: Iinterface1, Iinterface2
    {
        public int addition(int a, int b)
        {
            Console.WriteLine(a+b);
            return a+b;
        }
        public int sub(int a, int b)
        {
            Console.WriteLine(a-b);
            return a-b;
        }
        public int mul(int a, int b)
        {
            Console.WriteLine(a*b);
            return a*b;
        }
        public int div(int a, int b)
        {
            Console.WriteLine(a/b);
            return a/b;
        }
    }
    
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            Class c=new Class();
            c.addition(2,3);
            c.sub(3,1);
            c.mul(2,5);
            c.div(10,2);
            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 0,12 sec, cpu time: 0,12 sec, average memory usage: 12 Mb, average nr of threads: 2, absolute service time: 0,34 sec