function
<cstdio>
rewind
void rewind ( FILE * stream );
Set position of stream to the beginning
Sets the position indicator associated with stream to the beginning of the file.
The end-of-file and error internal indicators associated to the stream are cleared after a successful call to this function, and all effects from previous calls to ungetc on this stream are dropped.
On streams open for update (read+write), a call to rewind allows to switch between reading and writing.
Parameters
- stream
- Pointer to a FILE object that identifies the stream.
Example
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/* rewind example */
#include <stdio.h>
int main ()
{
int n;
FILE * pFile;
char buffer [27];
pFile = fopen ("myfile.txt","w+");
for ( n='A' ; n<='Z' ; n++)
fputc ( n, pFile);
rewind (pFile);
fread (buffer,1,26,pFile);
fclose (pFile);
buffer[26]='\0';
puts (buffer);
return 0;
}
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A file called myfile.txt is created for reading and writing and filled with the alphabet. The file is then rewinded, read and its content is stored in a buffer, that then is written to the standard output:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
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See also
- fseek
- Reposition stream position indicator (function
)
- fsetpos
- Set position indicator of stream (function
)
- fflush
- Flush stream (function
)