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.  If expression is false (0), it displays a diagnostic message on the standard output and exits (see exit(2V)).  Compiling with the cc(1V) option −DNDEBUG, or placing the preprocessor control statement

#define NDEBUG

before the “#include <assert.h>” statement effectively deletes assert() from the program. 

SYSTEM V DESCRIPTION

The System V version of assert() calls abort(3) rather than exit(). 

SEE ALSO

cc(1V), exit(2V), abort(3)

DIAGNOSTICS

Assertion failed: file f line n
The expression passed to the assert() statement at line n of source file f was false. 

SYSTEM V DIAGNOSTICS

Assertion failed: expression, file f, line n
The expression passed to the assert() statement at line n of source file f was false. 

Solbourne Computer, Inc.  —  13 Dec 1990