https://stackoverflow.com/questions/154136/why-use-apparently-meaningless-do-while-and-if-else-statements-in-macros https://stackoverflow.com/questions/154136/w

https://stackoverflow.com/questions/154136/why-use-apparently-meaningless-do-while-and-if-else-statements-in-macros https://stackoverflow.com/questions/154136/why-use-apparentl...