[ft] working with example1 in tutorial

[samaram s]

Hi,

   I am new to this.
    I just started learning how to use freetype API's by looking at the example.
    I am actually trying to convert a given character into Bitmap. I tried using
    example1.c in tutorial.
    Can anyone please explain me use of FT_SET_CHAR_SIZE and FT_LOAD_CHAR
     I read the documents but not understanding why we are multiplying it by 64
    in FT_SET_CHAR_SIZE.
    Please explain me.
    Thanks a lot in advance.