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### 16.5 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.