NAME

assert − program verification

USAGE

#include <assert.h>

assert(expression)

DESCRIPTION

Assert is a macro that indicates that 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 (zero).  Compiling with the cc(1), option −DNDEBUG effectively deletes assert from the program. 

DIAGNOSTICS

“Assertion failed: file f line n.” F is the name of the source file, and n is the line number of the assert statement in the source file.