P/Invoke with PowerShell (and small portion of C# code)

PInvokeTest.ps1

# Windows uses msvcrt.dll
Add-Type -Path .\test.cs
[Sample]::printf_win32("Hello, World %d!`r`n", 123)

# *nix uses libc
Add-Type -Path ./test.cs
[Sample]::printf_linux("Hello, World %d!`n", 123)

test.cs

using System;
using System.Runtime.InteropServices;

public static class Sample {
  [DllImport("msvcrt.dll", CharSet = CharSet.Ansi,
    CallingConvention = CallingConvention.Cdecl,
    SetLastError = false, ExactSpelling = true, EntryPoint = "printf")]
  public static extern int printf_win32(string fmt, int arg0);

  [DllImport("libc", CharSet = CharSet.Ansi,
    CallingConvention = CallingConvention.Cdecl,
    SetLastError = false, ExactSpelling = true, EntryPoint = "printf")]
  public static extern int printf_linux(string fmt, int arg0);
}