1ASSERT(3)                  Library Functions Manual                  ASSERT(3)
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NAME

6       assert - program verification
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SYNOPSIS

9       #include <assert.h>
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11       assert(expression)
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DESCRIPTION

14       Assert  is  a macro that indicates expression is expected to be true at
15       this point in the program.  It causes an exit(2) with a diagnostic com‐
16       ment  on  the  standard output when expression is false (0).  Compiling
17       with the cc(1) option -DNDEBUG effectively deletes assert from the pro‐
18       gram.
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DIAGNOSTICS

21       `Assertion  failed:  file  f  line  n.'  F is the source file and n the
22       source line number of the assert statement.
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267th Edition                      May 12, 1986                        ASSERT(3)