assert---Macro for Debugging Diagnostics#include <assert.h> void assert(int expression);
Description
Use this macro to embed debuggging diagnostic statements in
your programs. The argument expression should be an
expression which evaluates to true (nonzero) when your program
is working as you intended.
When expression evaluates to false (zero), assert
calls abort, after first printing a message showing what
failed and where:
Assertion failed: expression, file filename, line lineno
The macro is defined to permit you to turn off all uses of
assert at compile time by defining NDEBUG as a
preprocessor variable. If you do this, the assert macro
expands to
(void(0))
Returns
assert does not return a value.
Portability
The assert macro is required by ANSI, as is the behavior
when NDEBUG is defined.
Supporting OS subroutines required (only if enabled): close, fstat,
getpid, isatty, kill, lseek, read, sbrk, write.
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