ASSERT(3) BSD Library Functions Manual ASSERT(3)NAMEassert — expression verification macro
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 function abort(3) is called, effectively terminating the program.
If expression is true, the assert() macro does nothing.
The assert() macro may be removed at compile time by defining NDEBUG as a
macro (e.g., by using the cc(1) option -DNDEBUG).
assert(1 == 0);
generates a diagnostic message similar to the following:
Assertion failed: (1 == 0), function main, file assertion.c, line
The assert() macro conforms to ISO/IEC 9899:1999 (“ISO C99”).
An assert macro appeared in Version 6 AT&T UNIX.
BSD January 26, 1999 BSD