# 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.