Scarce swallowtail Scarce swallowtail The scarce swallowtail ("Iphiclides podalirius") is a butterfly belonging to the family Papilionidae. It is also called the sail swallowtail or pear-tree swallowtail. Subspecies include: "Iphiclides podalirius feisthamelii" is sometimes treated as a valid species, "Iphiclides feisthamelii". Despite the name "scarce swallowtail", this species is quite common. The scarcity of United Kingdom migrants is responsible for the English vernacular name. This species is widespread in the East Palearctic ecozone and in most of Europe with the exception of the northern parts. Its range extends northwards to Lower Lusatia and central Poland and eastwards across Asia Minor and Transcaucasia
Comma operator to how sequences of statements are enclosed in braces: codice_2 is a sequence of expressions, separated by commas, which evaluates to the last expression codice_3 while codice_4 is a sequence of statements, and does not evaluate to any value. A comma can only occur between two expressions – commas "separate" expressions – unlike the semicolon, which occurs at the end of a (non-block) statement – semicolons "terminate" statements. The comma operator has the lowest precedence of any C operator, and acts as a sequence point. In a combination of commas and semicolons, semicolons have lower precedence than commas, as semicolons