Java vs. C#

Command-line Interactive

Java
 
//Java use one main for command-line input or no input.
class Welcome
{
    public static void main(String[] args)
    {
        System.out.println("Hello, " + args[0]);
        System.out.println("Welcome!"); 
    }
} 

>javac Welcome.java
>java Welcome Judy
Hello, Judy
Welcome!


//interactive with user input
import java.io.*;
class InteractiveWelcome
{
  public static void main(String[] args) throws Exception
  {
    // Write to console/get input
    System.out.print("What is your name?: ");
    BufferedReader in = new BufferedReader(
               new InputStreamReader(System.in));
    String uname = in.readLine();
    System.out.println("Hello, " + uname);
    System.out.println("Welcome!"); 
  }
}
>javac InteractiveWelcome.java
>java InteractiveWelcome
What is your name?: Judy
Hello, Judy
Welcome!


String myInput;
int myInt; 
System.out.print("Please enter a number: ");
BufferedReader in = new BufferedReader(
               new InputStreamReader(System.in));
myInput = in.readLine();
myInt = Integer.parseInt(myInput);

C#
 
//c# can use one of 4 Mains 
using System;
class Welcome
{
    public static void Main(string[] args)
    {
        Console.WriteLine("Hello, {0}", args[0]);
        Console.WriteLine("Welcome!"); 
    }
} 
>csc Welcome.cs
>Welcome Judy
Hello, Judy
Welcome!


//interactive with user input
using System;
class InteractiveWelcome
{
    public static void Main()
    {
        // Write to console/get input
        Console.Write("What is your name?: ");
        string uname = Console.ReadLine();
        Console.WriteLine("Hello, {0}! ", uname);
        Console.WriteLine("Welcome!"); 
    }
}


>csc InteractiveWelcome.cs
>InteractiveWelcome
What is your name?: Judy
Hello, Judy
Welcome!


string myInput;
int myInt; 

Console.Write("Please enter a number: ");
myInput = Console.ReadLine();
myInt = Int32.Parse(myInput);