Name 

Description 

NDEBUG #define 

Header File
assert.h
Description
NDEBUG means "Use #define to treat assert as a macro or a true function".
Can be defined in a user program. If defined, assert is a true function; otherwise assert is a macro. 

assert 

Header File
assert.h
Category
Diagnostic Routines
Prototype
void assert(int test);
Description
Tests a condition and possibly aborts.
assert is a macro that expands to an if statement; if test evaluates to zero, the assert macro calls the _assert function
void _RTLENTRY _EXPFUNC _assert(char * __cond, char * __file, int __line);
and aborts the program. The _assert function calls abort and asserts the following a message on stderr:
Assertion failed: test, file filename, line linenum
The filename and linenum listed in the message are the source file name and line number where the assert macro appears.
If you place the #define... more