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C - Diagnostics

From EdWiki

Diagnostics:

The assert macro is used to add diagnostics to programs.

void assert( int expression )

If expression is zero when assert(expression) is executed, the assert macro will print a message on stderr, such as

Assertion failed: expression, file filename, line nnnn.

It then calls abort to terminate execution. The source filename and line number come from the preprocessor macros __FILE__ and __LINE__.

If NDEBUG is defined at the time is included, the assert macro is ignored.