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.-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.