o_195h4n6al16jb186b1b2qs7fgssa.pdf

Explanation:
afile1must exist before it can be opened for reading (r) or the
fopenfunction will fail. If the fopenfunction opens a file for writing
(w+) it does not have to already exist. If it doesn't exist, it will be created
and then opened.
fopen (Continued)
dsPIC
®
Language Tools Libraries
DS51456B-page 238
fprintf
2004 Microchip Technology Inc.
Description: Prints formatted data to a stream.
Include:
Prototype: int fprintf(FILE *stream, const char *format, ...);
Arguments: stream pointer to the stream in which to output data
format format control string
... optional arguments
Return Value: Returns number of characters generated or a negative number if
an
error occurs.
Remarks: The format argument has the same syntax and use that it has in
print.
Example: #include /* for fopen, fclose, */
/* fprintf, printf, */
/* FILE, NULL */
int main(void)
{
FILE *myfile;
int y;
char s[]="Printthis string";
int x = 1;
char a = '\n';
if ((myfile = fopen("afile", "w")) == NULL)
printf("Cannot open afile\n");
else
{
y = fprintf(myfile, "%s %d time%c", s, x, a);
printf("Number ofcharacters printed "
"to file = %d",y);
{
nums [x] = 10,0 / (x + 1);
printf ("10,0 /% d =% f \ n", x + 1, nums [x]);
}
numwrote = fwrite (nums, sizeof (double),
10, buf);
printf ("đã viết% dnumbers \ n \ n", numwrote);
fclose (buf);
}
khác
printf ("Không thể mở afile.out \ n");
Thư viện chuẩn C với hàm toán học
2004 Microchip Technology Inc DS51456B trang 241
if ((buf = fopen ("afile.out", "r +")) = NULL)
{
numread = fread (readnums, sizeof (double),
10, buf);
printf ("Đọc% số d \ n", numread);
for (x = 0; x