====== Exceptions ======

Exceptions are reactions to prohibited states of the program execution. The exception settings is defined in the Controller properties.

{{:en:mervis-ide:35-help:exceptions.png}}

===== Options =====

|Stop When Exception|Description                                                                                                                                                                              |
|TRUE               |If there is an exception, the program execution stops. In the System status tab it is displayed which exception appeared, and where.                                                     |
|FALSE              |If there is an exception, the program keeps on running. The block output diplays the status according to the exception table:\\ NaN - the value is not a number\\ - Infinity\\ + Infinity|

Exception catched in the System status:

{{:en:mervis-ide:35-help:exceptions_example.png}}

===== Exceptions =====

=== LN - natural logarithm ===

|Inputs|Outputs  |
|in = 0|-Infinity|
|in < 0|NaN      |

=== LOG - common logarithm ===

|Inputs|Outputs  |
|in = 0|-Infinity|
|in < 0|NaN      |

=== ASIN - Arc sinus ===

|Inputs |Outputs|
|in < -1|NaN    |
|in > 1 |NaN    |

=== ACOS - Arc cosinus ===

|Inputs |Outputs|
|in < -1|NaN    |
|in > 1 |NaN    |

=== ACOSH - Arc cosinus hyperbolicus ===

|Inputs|Outputs|
|in < 1|NaN    |

=== ATANH - Arc tangens hyperbolicus ===

|Inputs |Outputs  |
|in = -1|-Infinity|
|in = 1 |+Infinity|
|in < -1|NaN      |
|in > 1 |NaN      |

=== SQRT - Square root ===

|Inputs|Outputs|
|in < 0|NaN    |

=== EXP, EXP10 and ** - powers ===

|Inputs           |Outputs            |
|"in" is too large|+Infinity/-Infinity|

=== DIV - division without using en/eno ===

^Inputs                           ^Outputs  ^
|0/0                              |NaN      |
|X/0 where X<0                    |-Infinity|
|X/0 where X>0                    |+Infinity|
|X/0 where both inputs are ANY_INT|0        |

=== DIV - division using en/eno ===

|Inputs|Outputs           |
|X/0   |result=0 eno=false|

=== MOD - modulo without using en/eno ===

|Inputs                          |Outputs|
|X mod 0 where inputs are real   |NaN    |
|X mod 0 where inputs are ANY_INT|0      |

=== MOD - modulo using en/eno ===

^Inputs ^Outputs           ^
|X mod 0|result=0 eno=false|

=== RD - read from variables ===

Invalid address or range always returns an area with zeros.

=== WR - write to variables ===

Invalid address or range results in no writing.

=== Indirect virtual method call ===

Invalid pointer or reference results in no call.

=== Read and write into memory ===

Reading or writing beyond the address space results in no action.