How to reset scanf()

Question

How do you reset scanf() to read the beginning of the text without the use of fopen or fclose.

I have a stage 1 which reads half of the text file and stage 2 requires me reset the scanf() to beginning of the text and read it all the way. Any tips or guidance is appreciated. You Guys are the best!

EDIT: The text has ONLY numbers in it and the file is opened via /myprogram <txt.txt.

Answer 1

You can use fseek() or rewind().

rewind(fp);

or

fseek(fp, 0, SEEK_SET);

Answer 2

One can use rewind(FILE *fp) to reset the position to beginning of the file.