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struct test
{
float a;
int b;
};
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struct test
{
float a;
int b;
};
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#include <stdio.h>
#include <stdlib.h>
long filesize( FILE *fp )
{
    long int save_pos;
    long size_of_file;
    /* Save the current position. */
    save_pos = ftell( fp );
    /* Jump to the end of the file. */
    fseek( fp, 0L, SEEK_END );
    /* Get the end position. */
    size_of_file = ftell( fp );
    /* Jump back to the original position. */
    fseek( fp, save_pos, SEEK_SET );
    return( size_of_file );
}
int main( void )
{
    FILE *fp;
    fp = fopen( "aa.txt", "r" );
    if( fp != NULL ) {
        printf( "File size=%ld\n", filesize( fp ) );
        fclose( fp );
        return EXIT_SUCCESS;
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