AT&T UNIX™PC Unix System V Users Manual - tenox

ASSERT (3X) ASSERT (3X)
NAME
assert - verify program assertion
SYNOPSIS
#include < a.ssert.h >
assert (expression)
int expression;
DESCRIPTION
This macro is useful for putting diagnostics into programs. When
it is executed, if expression is false (zero), assert prints
"Assertion failed: expression, file xyz, line nnn"
on the standard error output and aborts. In the error message,
xyz is the name of the source file and nnn the source line number
of the assert statement.
Compiling with the preprocessor option -DNDEBUG (see cpp (1)),
or with the preprocessor control statement "#define NDEBUG"
ahead of the "#include < assert.h>" statement, will stop assertions
from being compiled into the program.
SEE ALSO
cpp( l), abort(3C).
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