in stack: int a;
in heap: int* pa = new int;
global: int a; (not in a function)
local static: static int a;
in stack: int a;
in heap: int* pa = new int;
global: int a; (not in a function)
local static: static int a;
static 3种用法
类的成员:。。。
函数中变量:。。。
全局:若全局变量仅在单个C文件中访问,则可以将这个变量修改为静态全局变量,以降低模块间的耦合度
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