The initial value of members of built-in or compound type depend on the scope of the object: At local scope those members are uninitialized, at global scope they are initialized to 0.

• 内置或复合类型的成员的初始值依赖于对象的作用域：在局部作用域中这些成员不被初始化，而在全局作用域中它们被初始化为0。