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16-Bit Language Tools Libraries
fread
Description:
Include:
Prototype:
Reads data from the stream.
<stdio.h>
size_t fread(void * ptr , size_t size , size_t nelem ,
FILE * stream );
Arguments:
ptr
size
nelem
stream
pointer to the storage buffer
size of item
maximum number of items to be read
pointer to the stream
DS51456E-page 60
Return Value:
Remarks:
Example:
Returns the number of complete elements read up to nelem whose
size is specified by size.
The function reads characters from a given stream into the buffer
pointed to by ptr until the function stores size * nelem characters
or sets the end-of-file or error indicator. fread returns n/size where n is
the number of characters it read. If n is not a multiple of size, the value
of the last element is indeterminate. If the function sets the error indica-
tor, the file-position indicator is indeterminate.
#include <stdio.h> /* for fread, fwrite, */
/* printf, fopen, fclose, */
/* sizeof, FILE, NULL */
int main(void)
{
FILE *buf;
int x, numwrote, numread;
double nums[10], readnums[10];
if ((buf = fopen("afile.out", "w+")) != NULL)
{
for (x = 0; x < 10; x++)
{
nums[x] = 10.0/(x + 1);
printf("10.0/%d = %f\n", x+1, nums[x]);
}
numwrote = fwrite(nums, sizeof(double),
10, buf);
printf("Wrote %d numbers\n\n", numwrote);
fclose(buf);
}
else
printf("Cannot open afile.out\n");
? 2008 Microchip Technology Inc.
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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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