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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../cpp/../cpp/../c/io/rewind.html below:

rewind - cppreference.com

Moves the file position indicator to the beginning of the given file stream.

The function is equivalent to fseek(stream, 0, SEEK_SET);, except that end-of-file and error indicators are cleared.

The function drops any effects from previous calls to ungetc.

(none)

This example shows how to read a file twice

#include <stdio.h>
 
char str[20];
 
int main(void)
{
    FILE *f;
    char ch;
 
    f = fopen("file.txt", "w");
    for (ch = '0'; ch <= '9'; ch++) {
        fputc(ch, f);
    }
    fclose(f);
 
    f = fopen("file.txt", "r");
    fread(str, 1, 10, f);
    puts(str);
 
    rewind(f);
    fread(str, 1, 10, f);
    puts(str);
    fclose(f);
 
    return 0;
}

Output:

• C11 standard (ISO/IEC 9899:2011):

• 7.21.9.5 The rewind function (p: 338)

• C99 standard (ISO/IEC 9899:1999):

• 7.19.9.5 The rewind function (p: 304)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.9.9.5 The rewind function

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