Introduction - If you have any usage issues, please Google them yourself
Demand given two line intersection. Enter divided into two types: user interface input, file input. Output is divided into two categories: user interface output, file output.
1.1 User Interface Input: The user can enter the coordinates of the point of the two lines described in the interface.
1.2 File Input: Users can read a text file txt format coordinate the two lines will be described.
1.3 User interface output: the intersection of two lines and use the chart display.
1.4 file output: the intersection of two straight and files stored in txt format.