C rewind() function

C library function - rewind()

The rewind() function is used to reposition the file pointer associated with stream to the beginning of the file.

Syntax:

void rewind(FILE *stream)

rewind() Parameters:

Return value from rewind()

• This function does not return any value.

A call to the rewind() function is the same as:

(void) fseek(stream, 0L, SEEK_SET)

except that rewind() shall also clear the error indicator.

Example: rewind() function

Following example first opens a file test.txt for input and output. It writes integers to the file, uses rewind() to reposition the file pointer to the beginning of the file, and then reads in the data.

#include <stdio.h>
FILE *stream; 
int p, q, r, s;
int main(void)
{
    p = 100; q = 200;
    /* Input data in the file */
   stream = fopen("test.txt", "w+");
   fprintf(stream, "%d %d\n", p, q);
    /* Now read the data file */
   rewind(stream);
   fscanf(stream, "%d", &r);
   fscanf(stream, "%d", &s);
   printf("Latest values are: %d and %d\n", r, s);
}

Output:

Latest values are: 100 and 200

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