# System Parameters

'*E' | Force E+ Convert String with Scientific Notation

## Description

If enabled, this parameter forces PxPlus to mandate that, when converting a string that may contain a numeric value in scientific notation (e.g. 1.2E+10), there must be a + (plus) sign following the E.

Setting this parameter can resolve issues that could occur using the NUM function against a string that may happen to look like a scientific notation (e.g. 1E10).

#### Important Note:
Setting this parameter will potentially cause problems when parsing JSON data as, by definition, JSON scientific notation does not require the sign.
If your application is processing JSON data, this parameter should be Off.

(The '*E' system parameter was added in PxPlus 2023.)

## Default

Off - PxPlus will accept numbers in scientific notation with or without a sign. If the sign is not present, PxPlus will assume a positive exponent.

## Example

->x$="1E10"
->y$="1E+10"
->print num(x$)
10000000000
->print num(y$)
10000000000

->set_param '*e'
->print num(x$)
Error #26: Variable type invalid
->print num(y$)
10000000000