vb6 - VB6 中未设置变量的默认值是多少？

Question

我正在使用一些旧代码，它定义了一个像这样的全局变量...

Public myvar

此变量从未被赋值，但稍后在测试中使用...

If myvar <> somevalue then
    'do something
End If

做某事时 somevalue 的值是多少？

Answer 1

• 默认值为Empty。
• 对于除 Empty、0 或 "" 之外的任何值，"Something will be done"...
  • ... 对于值 Nothing，代码将引发错误并且“某事不会完成”。

来自VB6 documentation

When variables are initialized, a numeric variable is initialized to 0, a variable-length string is initialized to a zero-length string (""), and a fixed-length string is filled with zeros. Variant variables are initialized to Empty. Each element of a user-defined type variable is initialized as if it were a separate variable.