HP 3000 Manuals HP 3000 Manuals
assert
Terminates the program if the assertion is false.
Syntax
#include <assert.h>
void assert (int expression);
Parameters
expression An integer value to be evaluated.
Return Values
None.
Description
The assert macro terminates the program if the assertion is false. The
assert macro takes a single integer (expression) argument. If the
expression evaluates to 0 (false), assert() writes a message containing
the expression that tested false and the line number where the assert
occurred. The program then terminates. The macro NDEBUG is referenced
but not defined in <assert.h>. If NDEBUG is defined at the point when
<assert.h> is included, the assert macro calls have no effect. The
NDEBUG macro enables the operation of the assert macro:
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| | |
| NDEBUG Definition | assert macro effect |
| | |
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| | |
| Defined | Calls are ignored (no debugging done) |
| | |
| Undefined | Calls are processed (debugging is done) |
| | |
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See Also
abort(), ANSI C 4.2.1.1, POSIX.1 8.1