博客主要讨论声明语句的确定赋值状态。若声明语句无初始化器，变量在语句终点和起点的确定赋值状态相同；若有初始化器，则变量的确定赋值状态如同语句列表，按声明顺序为每个有初始化器的声明设置赋值语句来确定。
12.3.3.4 Declaration statements
?If stmt is a declaration statement without initializers, then v has the
same definite assignment state at
the end point of stmt as at the beginning of stmt.
?If stmt is a declaration statement with initializers, then the definite
assignment state for v is
determined as if stmt were a statement list, with one assignment statement
for each declaration with
an initializer (in the order of declaration).
?If stmt is a declaration statement without initializers, then v has the
same definite assignment state at
the end point of stmt as at the beginning of stmt.
?If stmt is a declaration statement with initializers, then the definite
assignment state for v is
determined as if stmt were a statement list, with one assignment statement
for each declaration with
an initializer (in the order of declaration).
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