C + + relative and absolute paths

Learning memo turn from: http://www.cnblogs.com/vranger/p/3820783.html

Computer hard disk under the E-drive folder "test", "Test" under the sub-folder "file", "File" under the sub-folder "Data",

Computer Explorer displays the directory E:\test\file\data

Current Path E:\test\file

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1. Relative path, with forward slash '/'

1.1 Up-level directory pointing

./indicates the current path, equivalent to E:\test\file

.. /represents the upper-level path of the current path, equivalent to E:\test

.. /.. /indicates the first-level path on the current path, equivalent to E:

More pointers to ancestor paths and so on.

1.2 Pointing down a level directory

The./data represents the next-level path in the current path, equivalent to E:\test\file\data

The./data/xxx represents the lower-level path of the current path, equivalent to E:\test\file\data\xxx

More representations of the paths pointing down and so on.

2. Absolute path, with backslash ' \ '

E:\test

E:\test\file

E:\test\file\data

Relative path and absolute path usage in 3.c\c++ programming

In the C language, the backslash ' \ ' represents an escape character, so the absolute path needs to be represented as follows

FILE * FP;

fp = fopen ("E:\\test\\file\\data\\d.txt", "R");

It can also be represented by a relative path, not by the escape character limit:

FILE * FP;

fp = fopen ("E:/test/file/data/d.txt", "R");

Or, under current path E:\test\file, relative paths are represented as

FILE * FP;

fp = fopen ("./data/d.txt", "R");

Note: To add direct.h to the header file when using relative and absolute paths

C + + relative and absolute paths