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assert(3c)

assert(3C)               Standard C Library Functions               assert(3C)

NAME
       assert - verify program assertion

SYNOPSIS
       #include <assert.h>

       void assert(int expression);

DESCRIPTION
       The  assert()  macro  inserts  diagnostics into applications. When exe‐
       cuted, if expression is FALSE (zero), assert() prints the error message

         Assertion failed: expression, file xyz, line nnn



       on the standard error output and aborts. In the error message,  xyz  is
       the  name  of the source file and nnn the source line number of the as‐
       sert() statement. These are respectively the values of the preprocessor
       macros __FILE__ and __LINE__.


       Since assert() is implemented as a macro, the expression may  not  con‐
       tain any string literals.


       Compiling  with the preprocessor option -DNDEBUG or with the preproces‐
       sor control statement #define NDEBUG ahead of the  #include  <assert.h>
       statement, will stop assertions from being compiled into the program.


       Messages  printed  from this function are in the native language speci‐
       fied by the LC_MESSAGES locale category. See setlocale(3C).

ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSafe _ Standard‐
       See standards(7).


SEE ALSO
       abort(3C), gettext(3C), setlocale(3C), attributes(7), standards(7)

Oracle Solaris 11.4               30 Mar 2005                       assert(3C)
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