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() with a diagnostic comment on the standard output when expression is false (0).  Compiling with the cc() option −DNDEBUG effectively deletes assert from the program.

ENVIRONMENT

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

DIAGNOSTICS

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