Discussion
Which among the following is NOT a pointing device?
Answer: C
The keyed answer is Touchscreen.
A pointing device moves a cursor on the screen. A trackball, a mouse and a touchpad all do this by sensing the user's movement of a ball, the whole device or a finger on a pad, and sending relative motion to the computer, so each is a typical pointing device.
A touchscreen is touched directly on the display, which also shows the output, so it is a combined input and output surface and the question treats it as the odd one out. Many references do class a touchscreen as a pointing device as well, which is the weakness of the item; in this question the three that move a cursor are the ones counted.
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