缩进格式指导:CASE语句 CAsE express1on士s WHEN constant => 冬宫七 atement冬 冬 statement冬 WHEn constant2 = 多 tatement 冬吕 tatement 而 HEN constant3=> CAsE expression Is 冬彐 tatement冬 WHEN constant 1 令吕 tatement冬 冬吕 tatement冬 WHEN constant2 >>> 令宫 tatement多 WHEN OTHERS = WhEN constant 3 令 statement含 冬 tatement冬 WHEN OTHERS >多宫 tatement 多彐 tatement冬 END CASE: END CASE缩进格式指导：CASE语句