The nullable type modifier enables c to create value - type variables that indicate an undefined value 可空類型修飾符使c #能夠創(chuàng)建表示未定義值的值類型變量。
C 2 . 0 introduces nullable types , which are data types that may be set to an undefined value C # 2 . 0引入了可為空值的類型,這是可以設(shè)置成未定義值的數(shù)據(jù)類型。
They hold only one piece of data : a string , a number , the undefined value , a reference to another variable 它只保存一段數(shù)據(jù):一個字符串、一個數(shù)字、未定義的值以及對另一個變量的引用。
In addition , because perl is looking for a true value , it also ignores undefined values without complaining about them 另外,由于perl正在尋找一個真值,因此它也可以忽略未定義的值,而不會抱怨這些值尚未定義。
Explains the concept of undefined values , how to determine if a variable or property is undefined , and how to undefine variables and properties 解釋未定義值的概念、如何確定變量或?qū)傩允欠袷俏炊x的,以及如何取消定義變量和屬性。
Common faults picked up by these pragmas are ambiguous references and de - references , use of undefined values , and some help identifying typos for unused or undefined functions 這些標記引起的常見錯誤是:不正確的引用和取消引用,使用未定義的值,以及幫助判斷輸入錯誤,例如未使用的值或未定義的函數(shù)。
Thus , even if one of the above causes a change in control flow , the instructions at sequentially increasing addresses beyond the location of the change in control flow up to the next true end of the instruction group had the change of control flow not occurred , can still cause undefined values to be seen at the target of the change of control flow , if they cause a dependency violation 因而,即使上述的一個在控件流中導(dǎo)致某個變化,在繼續(xù)增加的超出控件流的地方一直到下次指令群真正結(jié)束的地址那些指令也不會發(fā)生,如果那些未知的值是不可靠的,那么控件流的變化目標導(dǎo)致了他們的出現(xiàn)。