A one-number function performs an operation using only the number in the display. To use any one-number function, press the function key **after** the number has been placed in the display.
Keystrokes Display
45 45
g LOG 1.6532
• Two-Number Functions and ENTER
A two-number function must have two numbers present in the calculator **before** executing the function. + ,-, *, √∑ are examples of two-number functions.
Terminating Digit Entry. When **keying in** two numbers to perform an operation, the calculator needs a signal that **digit entry is terminated** for the first number. This is done by pressing ENTER to separate the two numbers. If, on the other hand, one of the numbers is already in the calculator as the result of a previous operation, you do not need to use the ENTER key. All functions except the digit entry keys themselves( The digit keys, .(the decimal point), CHS, EEX, and <- ) have the effect of **terminating digit entry**.
Notice that, regardless of the number, a decimal point always appears and a set number of decimal places are displayed when you terminate digit entry(as by pressing ENTER).
Chain Calculations. In the following calculations, notice that:
• The ENTER key is used only for separating the **sequential** entry of two numbers.
• The operator is keyed in **only after** both operands are in the calculator.
• The result of any operation may itself become an operand. Such intermediate results are stored and retrieved on a last-in, first-out basis. New digits keyed in following an operation are treted as a new number.
