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Standard C Libraries
free
Description:
Include:
Prototype:
Frees memory.
<stdlib.h>
void free(void * ptr );
Argument:
ptr
points to memory to be freed
Remarks:
Frees memory previously allocated with calloc , malloc , or real-
loc . If free is used on space that has already been deallocated (by a
previous call to free or by realloc ) or on space not allocated with
calloc , malloc , or realloc , the behavior is undefined.
Example:
#include <stdio.h>
/* for printf, sizeof, */
/* NULL */
#include <stdlib.h> /* for malloc, free */
int main(void)
{
long *i;
if ((i = (long *)malloc(50 * sizeof(long))) ==
NULL)
printf("Cannot allocate memory\n");
else
{
printf("Memory allocated\n");
free(i);
printf("Memory freed\n");
}
}
Output:
Memory allocated
Memory freed
getenv
Description:
Include:
Prototype:
Get a value for an environment variable.
<stdlib.h>
char *getenv(const char * name );
Argument:
name
name of environment variable
Return Value:
Remarks:
? 2008 Microchip Technology Inc.
Returns a pointer to the value of the environment variable if successful;
otherwise, returns a null pointer.
This function must be customized to be used as described (see
pic30-libs ). By default there are no entries in the environment list
for getenv to find.
DS51456E-page 101
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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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