Polygonia comma Polygonia comma Polygonia comma, the eastern comma, is a North American butterfly in the family Nymphalidae, subfamily Nymphalinae. This butterfly is seasonally variable. The upperside of the summer form's hindwings are all black, whereas the winter forms hindwings are reddish orange. The underside of both forms is striped with dark and light brown. There is a silvery comma mark in the middle of the hindwing in both forms. Its wingspan is . The eastern comma may be spotted in woods near rivers, ponds, marshes, swamps, and other water sources. This butterfly seldom visits flowers, but rather feeds on sap, rotting
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