// Caveat implementor

下面是一个必须声明的局部变量，只是为了将一个常量传递给库函数:

// This only exists because Scott doesn't know how to use const correctly

http://fxr.watson.org/fxr/source/pci/if_rl.c 是好的来源。

/// <summary>
/// The possible outcomes of an update operation (save or delete)
/// </summary>
public enum UpdateResult
{

    /// <summary>
    /// Updated successfully
    /// </summary>
    Success = 0,

    /// <summary>
    /// Updated successfully
    /// </summary>
    Failed = 1
}

// Okay, let's do the loop, yeah come on baby let's do the loop
// and it goes like this ...

/* Emits a 7-Hz tone for 10 seconds.
  True story: 7 Hz is the resonant frequency of a
  chicken's skull cavity. This was determined
  empirically in Australia, where a new factory
  generating 7-Hz tones was located too close to a
  chicken ranch: When the factory started up, all the
  chickens died.
  Your PC may not be able to emit a 7-Hz tone. */

main()
{
    sound(7);
    delay(10000);
    nosound();
}

(Turbo C 2.0版本参考指南中的声音功能)