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Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 49 (Page No. 433 - 434)

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In the text we gave an example of how to draw a rectangle on the screen using the Windows GDI:

  • Rectangle(hdc, xleft, ytop, xright, ybottom);

Is there any real need for the first parameter (hdc), and if so, what? After all, the coordinates of the rectangle are explicitly specified as parameters. 

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