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1 fseekÒƶ¯Ö¸Õë»ñÈ¡
#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;
    }
    return EXIT_FAILURE;
}
2 stat»ñÈ¡
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
int main( void )
{
struct stat buf;
if( stat( "file", &buf ) != -1 ) {
printf( "File size = %d\n", buf.st_size );
}
return EXIT_SUCCESS;
}
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#include <stdio.h>
#include <string.h>
int main()
{
    int  i;
    long k;
    char buf[100];
    long int save_pos;
    FILE *fp;