/*程序员面试宝典*/Which of the following statements describe the results of executing the code snippet below in C++?

Which of the following statements describe the results of executing the code snippet below in C++?

1 int i;

2 

3 void main()

4 

5 {

6 

7     int i = i;

8 

9 }

 

    A. The i within main will have an undefined value.

    B. The compiler will allow this statement, but the linker will not be able to resolve the declaration of i.

    C. The i within main will have a value of 1.

    D. The compiler will not allow this statement.

    E. The result is compiler-dependent.

 

 作用域，存储类型，以及连接属性的相关问题

1.作用域：内部变量会屏蔽掉同名的外部变量，

2.第一个i的连接属性为static,存储于静态存储区，具有文件作用域；

　第二个i的连接属性为auto,存储于堆栈存储区，具有函数作用域，

3.连接属性为static,也就是存储类型为静态存储区的变量在声明时若未初始化，编译器会将其默认初始化为0；

　连接属性为auto,也就是存储类型为堆栈存储区的变量在声明时若未初始化，编译器不做任何动作，该变量状态为未定义。