Commenting here to bookmark this page. This concept is simply mind-blowing. To those who didn't follow the link, not only the code compiles in many languages,

Commenting here to bookmark this page. This concept is simply mind-blowing. To those who didn't follow the link, not only the code compiles in many languages, but it outputs 1 when compiled by the 1st language, 2 when compiled and run by the second, etc.