C/C++: static variables
2021/8/3 20:07:51
本文主要是介绍C/C++: static variables,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
static variable can only be initialized once. Compiler persist the variable till the end of the program.
Eg:
#include <iostream> int* a = NULL; void my_delete() { static int deleted = 0; std::cout << "deleted = " << deleted ++ << std::endl; std::cout << "&deleted = " << &deleted << std::endl; a = &deleted; } int main() { my_delete(); my_delete(); my_delete(); std::cout << "in main, a = " << a << std::endl; std::cout << "in main, deleted = " << *a << std::endl; std::cout << "in main, a = " << a << std::endl; std::cout << "in main, deleted = " << *a << std::endl; return 0; }
Result:
deleted = 0 &deleted = 0x6011a4 deleted = 1 &deleted = 0x6011a4 deleted = 2 &deleted = 0x6011a4 in main, a = 0x6011a4 in main, deleted = 3 in main, a = 0x6011a4 in main, deleted = 3
End
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