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If you start the timer and go to another iPhone application, the timer continues
running in the background.
Calculator
Using the Calculator
Tap numbers and functions in Calculator just as you would with a standard calculator.
When you tap the add, subtract, multiply, or divide button, a white ring appears
around the button to let you know the operation to be carried out. Rotate iPhone to
get an expanded scientific calculator.
Standard Memory Functions
C: Tap to clear the displayed number.
MC: Tap to clear the memory.
M+: Tap to add the displayed number to the number in memory. If no number is in
memory, tap to store the displayed number in memory.
M-: Tap to subtract the displayed number from the number in memory.
MR: Tap to replace the displayed number with the number in memory. If the button
has a white ring around it, there is a number stored in memory.
The stored number remains in memory when you switch between the standard and
scientific calculators.
Scientific Calculator Keys
Rotate iPhone to landscape orientation to display the scientific calculator.
94 Chapter 7 More Applications