descent n. 1.下降,降下。 2.下坡,傾斜。 3.家世,門第,血統(tǒng)。 4.【法律】繼承,世襲。 5.一代;〔古語〕子孫,后裔。 6.突然襲擊。 7.屈尊,降格。 be of France descent 祖籍是法國。 be of good descent 出身好。 descent of man 人類由來。 make a descent upon 襲擊,侵入。
Symptoms : a program that performs a recursive descent over a data structure throws a class - cast exception 癥狀:在數(shù)據(jù)結(jié)構(gòu)上執(zhí)行遞歸下行時拋出類強制轉(zhuǎn)換異常。
Since member items need to be valid objects prior to their inclusion in larger structures , the simplest recursive descent approach would not work 由于在成員項所包含的內(nèi)容出現(xiàn)在較大型的結(jié)構(gòu)之前,成員項必須是有效對象,所以最簡單的遞歸繼承方法不起作用。
A class - cast exception often occurs in a program that is performing a recursive descent over a data structure , usually when some part of the code is descending two levels per method call and is not dispatching appropriately on the second descent 類強制轉(zhuǎn)換經(jīng)常發(fā)生在遞歸下行數(shù)據(jù)結(jié)構(gòu)的程序中,通常是當代碼的某些部分在每次方法調(diào)用中下行了兩級且在第二次下行時調(diào)度不當時發(fā)生的。
As there are various types and formats of traffic telegrams , our method shows how to define the formats of telegrams , the grammar rule and the recursive descent - parsing algorithm to analyze the telegrams . the results shows it has high accuracy and adaptation for many types of telegrams , each of which has several formats 該算法基于自上而下的語法分析,實現(xiàn)了包括不規(guī)范電報在內(nèi)的航管電報的自動識別及自動處理,實際應用表明該算法有很好的適應性和準確性,大大提高了識別率和正確率。