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ASSERT (3) | C library functions | Unix Manual Pages | :man

NAME

assert - expression verification macro

CONTENTS

Synopsis
Description
Examples
See Also
Standards
History

SYNOPSIS


.In assert.h assert expression

DESCRIPTION

The assert macro tests the given expression and if it is false, the calling process is terminated. A diagnostic message is written to stderr and the function abort(3) is called, effectively terminating the program.

If expression is true, the assert macro does nothing.

The assert macro may be removed at compile time by defining NDEBUG as a macro (e.g., by using the cc(1) option -D NDEBUG).

EXAMPLES

The assertion:

"assert(1 == 0);"

generates a diagnostic message similar to the following:

"Assertion failed: (1 == 0), function main, file assertion.c, line 100."

SEE ALSO

abort(3)

STANDARDS

HISTORY


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