assert(3)assert(3)Nameassert - program verification
The macro indicates expression is expected to be true at this point in
the program. It causes an with a diagnostic comment on the standard
error when expression is false (0). Compiling with the option -DNDEBUG
effectively deletes from the program.
`Assertion failed: a, file f n'. The a is the assertion that failed; f
is the source file and n the source line number of the statement.