NAME

assert − program verification

SYNOPSIS

#include <assert.h>

void assert(int expression);

DESCRIPTION

Assert is a macro that indicates expression is expected to be true at this point in the program.  It causes an abort(3) with a diagnostic comment on stderr 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. 

7th Edition  —  August 1, 1992