@文心快码initialized and declared 'extern 文心快码 1. 解释'extern'关键字的含义和用途 extern关键字在C和C++语言中用于声明一个变量或函数是在别的文件中定义的。它告诉编译器该变量或函数在程序的其他地方已经存在,这里不需要重新定义,可以直接使用。其主要用途是实现跨文件的全局变量或函数共享。 2. 解释变量初始化的概念 变
initialized and declared 'extern' 在C语言中,变量的声明和定义是非常重要的概念。对于需要被多个文件使用的变量,在进行声明和定义时需要特别注意。本文将介绍初始化和声明为“extern”的概念,并讨论它们在C语言中的作用。 首先,我们来看一下变量的初始化。初始化是指在定义变量时给它一个初始值。在C语言中,对于...
在引用全局变量的过程中,一开始这样引用 extern int print = 2; 结果报 'print' initialized and declared 'extern' 警告,后来把引用和赋值分开写,Warning disappear extern int print; /*引用外部/全局变量*/ print = 2; 记:我是个追求完美的人,至少在程序的世界里是这样。看到写得不规范的程序,我的心就很...
The GCC compiler complains of initialized and declared 'extern' [enabled by default] for all my external variables. As an example In the .h file I have extern const char stCR[2]; In the .c file I have extern const char stCRLF[]={"\r\n\0"}; This works fine fo...
Local variables that are declared static have the same lifetime as global variables even though their visibility is limited to the function where they are defined. This option does not apply to extern variables. Because extern variables can be declared and initialized outside the scope of a ...
From reading QCoreApplication source code, I now understand argv cannot change during the process lifetime. So I declared it as a global static member. I do the following sequence and check the memory location of argv. Here is an example of memory location SI_Load: argv = 0x000007fee3fd...