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问题描述
如果我写这样:
#include <iostream>
int main()
{
using namespace std;
{int n;n=5;} cout<<n;
system("pause");
return 0;
}
编译器告诉我n是未声明的。然后我试图使其静态,但是,再次,编译器告诉我,它是未申报。不是变量声明的静态有程序范围?
The compiler tells me that n is undeclared. Then I tried making it static, but again, the compiler tells me that it is undeclared. Doesn't a variable declated static have program scope? If not, how do I use n in this program?
推荐答案
你的范围与生命周期混淆。静态变量的生命周期等于程序的生命周期,但它们仍然遵循基于声明位置的范围规则。
You're confusing scope with lifetime. Static variables have a lifetime equal to the program's lifetime, but they still follow scoping rules based on where they are declared.
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