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C Library - <assert.h>

The assert.h header file of the C Standard Library provides a macro called assert which can be used to verify assumptions made by the program and print a diagnostic message if this assumption is false.

The defined macro assert refers to another macro NDEBUG which is not a part of <assert.h>. If NDEBUG is defined as a macro name in the source file, at the point where <assert.h> is included, the assert macro is defined as follows −

 #define assert(ignore) ((void)0)

Library Macros

Following is the only function defined in the header assert.h −

Sr.No.	Function & Description
1	void assert(int expression) This is actually a macro and not a function, which can be used to add diagnostics in your C program.
2	static_assert(boolean_expression, message) This macro issues a compile-time diagnostic if the value of a constant expression is false.

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