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assert(3) [bsd man page]

ASSERT(3)						     Library Functions Manual							 ASSERT(3)

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)

Check Out this Related Man Page

assert(3C)																assert(3C)

assert - verify program assertion SYNOPSIS
#include <assert.h> void assert(int expression); The assert() macro inserts diagnostics into applications. When executed, 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 assert() statement. These are respectively the values of the preprocessor macros __FILE__ and __LINE__. Since assert() is implemented as a macro, the expression may not contain any string literals. Compiling with the preprocessor option -DNDEBUG (see cc(1B)), or with the preprocessor 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 specified by the LC_MESSAGES locale category. See setlocale(3C). See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ cc(1B), abort(3C), gettext(3C), setlocale(3C), attributes(5), standards(5) 30 Mar 2005 assert(3C)

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