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BSD 2.11 - man page for assert (bsd section 3)

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ASSERT(3)										ASSERT(3)

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.  It causes an exit(2) with a diagnostic  comment  on  the  standard  output  when
       expression  is  false  (0).   Compiling with the cc(1) option -DNDEBUG effectively deletes
       assert from the program.

DIAGNOSTICS
       `Assertion failed: file f line n.'  F is the source file and n the source line  number  of
       the assert statement.

7th Edition				   May 12, 1986 				ASSERT(3)
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