NAME

assert − program verification

SYNTAX

#include <assert.h>

assert(expression)

DESCRIPTION

The assert macro indicates expression is expected to be true at this point in the program.  It causes an exit(2) with a diagnostic comment on the standard output when expression is false (0).  Compiling with the cc(1) option −DNDEBUG effectively deletes assert from the program.

ENVIRONMENT

When your program is complied using the System V environment, an error message is printed without calling fprintf. 

DIAGNOSTICS

‘Assertion failed: file f line n.’ The f is the source file and n the source line number of the assert statement.