program, C# - rextester

Language: Layout:

using System;  
    using System.Collections.Generic;  
    using System.Linq;  
    using System.Text;  
    using System.Threading.Tasks;  
    namespace CalculatorApp {  
        class Program {  
            static void Main(string[] args) {  
                Console.WriteLine("Enter the action to be performed");  
                Console.WriteLine("Press 1 for Addition");  
                Console.WriteLine("Press 2 for Subtraction");  
                Console.WriteLine("Press 3 for Multiplication");  
                Console.WriteLine("Press 4 for Division \n");  
                int action = Convert.ToInt32(Console.ReadLine());  
                Console.WriteLine("Enter 1st input");  
                int input_1 = Convert.ToInt32(Console.ReadLine());  
                Console.WriteLine("Enter 2nd input");  
                int input_2 = Convert.ToInt32(Console.ReadLine());  
                int result = 0;  
                switch (action) {  
                    case 1: {  
                        result = Addition(input_1, input_2);  
                        break;  
                    }  
                    case 2: {  
                        result = Subtraction(input_1, input_2);  
                        break;  
                    }  
                    case 3: {  
                        result = Multiplication(input_1, input_2);  
                        break;  
                    }  
                    case 4: {  
                        result = Division(input_1, input_2);  
                        break;  
                    }  
                    default:  
                        Console.WriteLine("Wrong action!! try again");  
                        break;  
                }  
                Console.WriteLine("The result is {0}", result);  
                Console.ReadKey();  
            }  
            //Addition  
            public static int Addition(int input_1, int input_2) {  
                int result = input_1 + input_2;  
                return result;  
            }  
            //Substraction  
            public static int Subtraction(int input_1, int input_2) {  
                int result = input_1 + input_2;  
                return result;  
            }  
            //Multiplication  
            public static int Multiplication(int input_1, int input_2) {  
                int result = input_1 + input_2;  
                return result;  
            }  
            //Division  
            public static int Division(int input_1, int input_2) {  
                int result = input_1 + input_2;  
                return result;  
            }  
        }  
    }

Show compiler warnings [ + ] Show input
Compilation time: 1.53 sec, absolute running time: 10.6 sec, cpu time: 0 sec, memory peak: 0 Mb, absolute service time: 12,31 sec