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### 15.5 Modes Menu

    |----+----+----+----+----+----5
    |FLT |FIX |SCI |ENG |GRP |    |
    |----+----+----+----+----+----|
    |RAD |DEG |FRAC|POLR|SYMB|PREC|
    |----+----+----+----+----+----|
    |SWAP|RLL3|RLL4|OVER|STO |RCL |
    |----+----+----+----+----+----|

The keys in this menu manipulate modes, variables, and the stack.

The `FLT`, `FIX`, `SCI`, and `ENG` keys select floating-point, fixed-point, scientific, or engineering notation. `FIX` displays two digits after the decimal by default; the others display full precision. With the `INV` prefix, these keys pop a number-of-digits argument from the stack.

The `GRP` key turns grouping of digits with commas on or off. `INV GRP` enables grouping to the right of the decimal point as well as to the left.

The `RAD` and `DEG` keys switch between radians and degrees for trigonometric functions.

The `FRAC` key turns Fraction mode on or off. This affects whether commands like `/` with integer arguments produce fractional or floating-point results.

The `POLR` key turns Polar mode on or off, determining whether polar or rectangular complex numbers are used by default.

The `SYMB` key turns Symbolic mode on or off, in which operations that would produce inexact floating-point results are left unevaluated as algebraic formulas.

The `PREC` key selects the current precision. Answer with the keyboard or with the keypad digit and `ENTER` keys.

The `SWAP` key exchanges the top two stack elements. The `RLL3` key rotates the top three stack elements upwards. The `RLL4` key rotates the top four stack elements upwards. The `OVER` key duplicates the second-to-top stack element.

The `STO` and `RCL` keys are analogous to `s t` and `s r` in regular Calc. See Store and Recall. Click the `STO` or `RCL` key, then one of the ten digits. (Named variables are not available in Keypad mode.) You can also use, for example, `STO + 3` to add to register 3.

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