本机中，char类型数据占用1byte, unsigned int, int, long int, float类型的数据占用4 bytes， double类型的数据占用8bytes.
至于指向所有基本数据类型的指针（char*, int* , double*等）都是占用4bytes， 可以使用sizeof函数进行测量。
The<< operator on std::cout is overloaded. Its behavior depends on the type of the right operand.
The reason is that std::cout will treat a char* as a pointer to( the first character of) a C-style string and print it as such.
If you want to the address instead, you can just cast it to a pointer that isn‘t treated that way, something like:
cout<<(void*) terry; 或者cout<<(const void*) terry;
点运算符作用于对象，用于获取对象拥有的字段或方法。
箭头运算符作用于对象指针，先或者指针指向的对象，再隐式调用点运算符，获取对象拥有的字段或方法。
原文：http://www.cnblogs.com/cbyzju/p/5244000.html