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Standard C Libraries
2.3
<ASSERT.H> DIAGNOSTICS
The header file assert.h consists of a single macro that is useful for debugging logic
errors in programs. By using the assert statement in critical locations where certain
conditions should be true, the logic of the program may be tested.
Assertion testing may be turned off without removing the code by defining NDEBUG
before including <assert.h> . If the macro NDEBUG is defined, assert() is ignored and
no code is generated.
assert
Description:
Include:
Prototype:
Argument:
Remarks:
Example:
? 2008 Microchip Technology Inc.
If the expression is false, an assertion message is printed to stderr and
the program is aborted.
<assert.h>
void assert(int expression );
expression The expression to test.
The expression evaluates to zero or non-zero. If zero, the assertion
fails, and a message is printed to stderr. The message includes the
source file name ( __ FILE __ ), the source line number ( __ LINE __ ),
the expression being evaluated and the message. The macro then calls
the function abort() . If the macro _VERBOSE_DEBUGGING is defined,
a message will be printed to stderr each time assert() is called.
#include <assert.h> /* for assert */
int main(void)
{
int a;
a = 2 * 2;
assert(a == 4); /* if true-nothing prints */
assert(a == 6); /* if false-print message */
/* and abort */
}
Output:
sampassert.c:9 a == 6 -- assertion failed
ABRT
with _VERBOSE_DEBUGGING defined:
sampassert.c:8 a == 4 -- OK
sampassert.c:9 a == 6 -- assertion failed
ABRT
DS51456E-page 13
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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