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# PR_ASSERT
Terminates execution when a given expression is `FALSE`.
## Syntax
```{code}
#include <prlog.h>
void PR_ASSERT ( expression );
```
### Parameters
The macro has this parameter:
expression
: Any valid C language expression that evaluates to `TRUE` or
`FALSE`.
### Returns
Nothing
## Description
This macro evaluates the specified expression. When the result is zero
(`FALSE`) the application terminates; otherwise the application
continues. The macro converts the expression to a string and passes it
to `PR_Assert`, using file and line parameters from the compile-time
environment.
This macro compiles to nothing if compile-time options are not specified
to enable logging.