8. Manipulators for Floating-point Data Types

There are three possible ways to format floating point values
- Default: cout chooses best format using n digits
```
    cout << value // 1234.57
```
- fixed: no exponent; n digits after the floating-point.
```
    cout << fixed << value // 1234.56789
```
- scientific: one digit before the decimal point plus exponent; n digits after the floating-point.
```
    cout << scientific << value // 1.234568e+03
```
In fixed and scientific notations precision (discussed later) specifies exactly how many digits to display after the decimal point, even if they are trailing decimal zeros.

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