Hi Manish, Because of C promotion rules, you are probably seeing this on your platform (other platforms may have different behavior, depending on the bit-sizes of long and int): 0x0 is taken to be a signed int. 0xFFFFFFFF is taken to be an unsigned int. If you want 0xFFFFFFFF to be treated as a signed int, do this: ((signed int)0xFFFFFFFF) If you want 0x0 to be treated as an unsigned int, do one of these; 0x0U ((unsigned int)0x0) HTH, --Eljay
