1. Header file
1. Function prototype
2. Symbolic constants defined using #define and const
3. Structural declaration
4. Class declaration
5. Template declaration
6. Inline functions
2. Linkability of static storage
external, internal, none
3. get() reads empty line false
get(char*,int) reads an empty line and causes cin to be false
4. Const constants are placed in header files
The constant declared by const is internally linked; each file that references the header file will have a const constant
5. Locating the new operator
//从buffer1内分配出内存空间，但是不能手动释放
//因为此时的buffer1并不在delete的管辖范围内
char buffer1[500];
int* p1 = new(buffer1) int [20];
//此时的buffer2的内存可以释放
char* buffer2 = new char[50];
char* p2 = new (buffer2) char[20];
delete p2;//但这样操作不被允许。
//原因：delete和常规new运算符搭配使用，但是不能和定位new运算符搭配。
6. The new operator can be overloaded
The content in 5 shows that the new operator has been overloaded
7. using declaration and using compilation
namespace jill{
int ftech;
double test(){
cout<<"test:"<<endl;
}
}
char fetch;
int main(){
using fill::fetch;
double fetch;//不允许
cout<<fetch;
}namespace jill{
int ftech;
double test(){
cout<<"test:"<<endl;
}
}
char fetch;
int main(){
using fill;
double fetch;//允许
cout<<fetch<<endl;//局部的fetch
cout<<fill::fetch<<endl;
cout<<::fetch<<endl;//全局的fetch
}