iPhone THE MISSING MANUAL - Cdn.oreilly.com

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Countdown timers are everywhere in life. They measure the time of periods
in sports games, of cooking times in the kitchen, of stunts on Survivor. But on
the iPhone, the timer has a especially handy function: It can turn off the music
or video after a specified amount of time. In short, it’s a Sleep timer that plays
you to sleep, then shuts off to save power.
To set the timer, open the Clock app and then tap Timer. Spin the two dials to
specify the number of hours and minutes you want to count down.
Then tap the When Timer Ends control to set up what happens when the
timer reaches 0:00. Most of the options here are ringtone sounds, so you’ll
have an audible cue that the time’s up. The top one, though, Sleep iPod, is
the aforementioned Sleep timer. It stops audio and video playback at the
appointed time, so that you (and the iPhone) can go to sleep. Tap Set.
Finally, tap Start. Big clock digits count down toward zero. While it’s in progress,
you can do other things on the iPhone, change the When Timer Ends
settings, or just hit Cancel to forget the whole thing.
Calculator
The iPhone wouldn’t be much of a computer without a calculator, now would
it?
And here it is, your basic four-function memory calculator. Tap out equations
(like 15.4 x 300=) to see the answer at the top.
When you tap one of the operators (like x, +, –, or ÷) it sprouts a white outline to
help you remember which operation is in progress. Let’s see an ordinary calculator
do that!
The Memory function works like a short-term storage area that retains numbers
temporarily, making it easier to work on complicated problems.
When you press m+, whatever number is on the screen gets added to the
number already in the memory and the mr/mc button glows with a white
ring to let you know you’ve stored something there. Press m– to subtract the
currently displayed number from the number in memory.
Chapter 9