This silents GCC warnings (in 64 bits) about casting integer to pointer of different size.

cast result of "sizeof()" to "int" in testcase, silents GCC warnings about signed/unsigned comparisons

--HG--
extra : transplant_source : %9E%5C%97%85%EC%7C%E7%EB%0AZ%8E%1A%B1%C0%1F%14%AA%5B%25R

--HG--
extra : transplant_source : -%B8%D3%E8%BB%2C%A3B1%D1%8B%C3%06M%16%82%F1%91%B7G

--HG--
extra : transplant_source : %03%EF%05%8Dq3%FB%88%89G%2B%BC%7B%A5%A57%3A%C6%0Bs

--HG--
extra : transplant_source : %96m%88%15%985T%8E%FF%CEW%16%5B%E3%1E%90%8E%23%00%AE

--HG--
extra : transplant_source : H%22Z%EF%DA%20m4l%C6%8A%EB%94%DD%9B%DA%20%0Bn%C6

--HG--
extra : transplant_source : %0C%16_W%14l%E8%11%CC%EBc%97%B3%23%B2%87%7D%C0uY

--HG--
extra : transplant_source : %E1%9D%DB%8B%E0%1D%C3%AEMD%7Cn%AA%D95%16%D9%085%9C

--HG--
rename : Demos/Setup.py => Demos/setup.py

Split int/float division cases for efficiency, make it work even if C compiler takes floor (don't know of any that do).