数组名和指针区别

 1         char  str[100]="changedStr";
 2         
 3         char *a = new char [100];
 4         strcpy(a,"String A");
 5         cout<<"a: "<<a<<endl;
 6         *(char **)&a = str;
 7         cout<<"a: "<<a<<endl;
 8         
 9         char c[100]="String B";
10         char * b = c;    
11         cout<<"b: "<<b<<endl;
12         *(char **)&b = str; // 等价于 b = str
13         cout<<"b: "<<b<<endl;
14 
15         cout<<"c: "<<c<<endl;
16         *(char **)&c = str; // 等价于 c = str. 前者未定义行为；后者编译器报错。
17         cout<<"c: "<<c<<endl;

结果：

a: String A
a: changedStr
b: String B
b: changedStr
c: String B
c: @Ti //未定义行为

posted on 2012-11-21 16:36 yaozhaoyz 阅读(122) 评论(0) 编辑收藏举报