ASSERT(3) | Library Functions Manual | ASSERT(3) |
assert
—
expression verification macro
#include
<assert.h>
assert
(expression);
The
assert
()
macro tests the given expression and if it is false,
the calling process is terminated. A diagnostic message is written to
stderr and the
abort(3) function is called, effectively
terminating the program.
If expression is true, the
assert
()
macro does nothing.
The
assert
()
macro may be removed at compile time with the
cc(1) option
-DNDEBUG
.
The following diagnostic message is written to stderr if expression is false:
"assertion \"%s\" failed: file \"%s\", line %d\n", \ "expression", __FILE__, __LINE__);
The assert
() macro conforms to
ANSI X3.159-1989
(“ANSI C89”).
A assert
macro appeared in
Version 6 AT&T UNIX.
June 9, 1993 | macOS 14.6 |