c ++ pre-compiler macros (continually updated)

1. The concept of pre-compiled macro

Some Microsoft official language:
. At The Visual C ++ Compiler predefines Certain Preprocessor Macros, DEPENDING ON at The Language (C or C ++), at The Compilation target, and at The Chosen Compiler Options
VC ++ compiler to pre-define some preprocessor macros, which depending on language, compiler and the selected target editor options
precompiled generally macro " __" and ending with " __" at the end, in the middle of all uppercase words, if a plurality of words composed of, between using the word " _" connected.

2.__FILE__

__FILE__: Displays the current name of the source file.
When will this macro function on and on macro generated is not the same result.
head File:

#include<iostream>
using namespace std;
#define HR(){cout<<__FILE__<<":in #define"<<endl;}
void TestFile();

Source File

#include"Test.h"
void TestFile() {
	cout << __FILE__<<":in function"<<endl;
}

Test file

int main()
{
	TestFile();
	HR();
	return 0;
}

Test Results

Conclusion: The macro __FILE__file name indicates the call, the function to specify a file name to achieve

3.__LINE__

__LINE__: Displays the current file executed
when the macro will be placed on the macro function and is produced different results.
Can refer to the __FILE__usage, the next three files are given

#include<iostream>
using namespace std;
#define HR(){cout<<__LINE__<<":in #define"<<endl;}
void TestFile();

#include"Test.h"
void TestFile() {
	cout << __LINE__<<":in function"<<endl;
}

int main()
{
	TestFile();
	HR();
	return 0;
}

Conclusion: The macro __LINE__file name indicates the call, the function to specify a file name to achieve