NAME

assert − program verification

SYNOPSIS

#include <assert.h>

assert(expression)

DESCRIPTION

assert is a macro that 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. 

DIAGNOSTICS

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

September 02, 1992