Zero initialization

cppreference Zero initialization

Sets the initial value of an object to zero.

NOTE:

1、描述的是一种执行效果

Syntax

Note that this is not the syntax for zero initialization, which does not have a dedicated syntax in the language. These are examples of other types of initializations, which might perform zero initialization.

syntax
static T object ;
T () ; T t = {} ; T {} ;	As part of value-initialization sequence for non-class types and for members of value-initialized class types that have no constructors, including value initialization of elements of aggregates for which no initializers are provided.
CharT array [ n ] = "";