C/stdio.h/rewind
rewind: moves the file position pointer back to the start
//Header file: #include <stdio.h>
//Declaration: void rewind(FILE *stream);
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
FILE *fp;
if((fp=fopen("test", "r"))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
while(!feof(fp)){
putchar(getc(fp));
}
rewind(fp);
while(!feof(fp)){
putchar(getc(fp));
}
fclose(fp);
}