August 2007
Beginner
304 pages
7h 49m
English
Content preview from iPhone: The Missing Manual
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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 × 300=) to see the answer at the top.
Tip
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.
And what is the number in memory? Press mr/mc to display it—to use it in a subsequent calculation, for example.
Finally, tap mr/mc twice to clear the memory and do away with the white ring.
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