編程中的語句
『壹』 C語言程序中的語句都用什麼作為結束符
C語言規定，語句的結束符用分號(；)來進行標識。
C語言中語句分為簡單語句（simple statement）和復合語句（compound statement）。
簡單語句以分號作尺迅笑為結束。其中簡單語句里陵含面又有賦值語句、聲明語句、結構化語句、函數調用語句和 空語句。復合語句指用花昌戚括弧{ } 將簡單語句甚至另一些復合包起來，所以就以}作為語句結束的標記。
『貳』 有哪些和編程有關的經典語句
One man's constant is another man's variable.
Functions delay binding: data structures ince binding. Moral: Structure data late in the programming process.
Syntactic sugar causes cancer of the semi-colons.
Every program is a part of some other program and rarely fits.
If a program manipulates a large amount of data, it does so in a small number of ways.
Symmetry is a complexity recing concept (co-routines include sub-routines); seek it everywhere.
It is easier to write an incorrect program than understand a correct one.
A programming language is low level when its programs require attention to the irrelevant.
It is better to have 100 functions operate on one data structure than 10 functions on 10 data structures.
Get into a rut early: Do the same processes the same way. Accumulate idioms. Standardize. The only difference (!) between Shakespeare and you was the size of his idiom list - not the size of his vocabulary.
If you have a procere with 10 parameters, you probably missed some.
Recursion is the root of computation since it trades description for time.
If two people write exactly the same program, each should be put in micro-code and then they certainly won't be the same.
In the long run every program becomes rococo - then rubble.
Everything should be built top-down, except the first time.
Every program has (at least) two purposes: the one for which it was written and another for which it wasn't.
If a listener nods his head when you're explaining your program, wake him up.
A program without a loop and a structured variable isn't worth writing.
A language that doesn't affect the way you think about programming, is not worth knowing.
Wherever there is molarity there is the potential for misunderstanding: Hiding information implies a need to check communication.
Optimization hinders evolution.
A good system can't have a weak command language.
To understand a program you must become both the machine and the program.
Perhaps if we wrote programs from childhood on, as alts we'd be able to read them.
One can only display complex information in the mind. Like seeing, movement or flow or alteration of view is more important than the static picture, no matter how lovely.
There will always be things we wish to say in our programs that in all known languages can only be said poorly.
Once you understand how to write a program get someone else to write it.
Around computers it is difficult to find the correct unit of time to measure progress. Some cathedrals took a century to complete. Can you imagine the grandeur and scope of a program that would take as long?
For systems, the analogue of a face-lift is to add to the control graph an edge that creates a cycle, not just an additional node.
In programming, everything we do is a special case of something more general - and often we know it too quickly.
Simplicity does not precede complexity, but follows it.
Programmers are not to be measured by their ingenuity and their logic but by the completeness of their case analysis.
The 11th commandment was "Thou Shalt Compute" or "Thou Shalt Not Compute" - I forget which.
The string is a stark data structure and everywhere it is passed there is much plication of process. It is a perfect vehicle for hiding information.
Everyone can be taught to sculpt: Michelangelo would have had to be taught how not to. So it is with the great programmers.
The use of a program to prove the 4-color theorem will not change mathematics - it merely demonstrates that the theorem, a challenge for a century, is probably not important to mathematics.
The most important computer is the one that rages in our skulls and ever seeks that satisfactory external emulator. The standardization of real computers would be a disaster - and so it probably won't happen.
Structured Programming supports the law of the excluded muddle.
Re graphics: A picture is worth 10K words - but only those to describe the picture. Hardly any sets of 10K words can be adequately described with pictures.
There are two ways to write error-free programs; only the third one works.
Some programming languages manage to absorb change, but withstand progress.
You can measure a programmer's perspective by noting his attitude on the continuing vitality of FORTRAN.
In software systems it is often the early bird that makes the worm.
Sometimes I think the only universal in the computing field is the fetch-execute-cycle.
The goal of computation is the emulation of our synthetic abilities, not the understanding of our analytic ones.
Like punning, programming is a play on words.
As Will Rogers would have said, "There is no such thing as a free variable."
The best book on programming for the layman is "Alice in Wonderland"; but that's because it's the best book on anything for the layman.
Giving up on assembly language was the apple in our Garden of Eden: Languages whose use squanders machine cycles are sinful. The LISP machine now permits LISP programmers to abandon bra and fig-leaf.
When we understand knowledge-based systems, it will be as before - except our finger-tips will have been singed.
Bringing computers into the home won't change either one, but may revitalize the corner saloon.
Systems have sub-systems and sub-systems have sub-systems and so on ad infinitum - which is why we're always starting over.
So many good ideas are never heard from again once they embark in a voyage on the semantic gulf.
Beware of the Turing tar-pit in which everything is possible but nothing of interest is easy.
A LISP programmer knows the value of everything, but the cost of nothing.
Software is under a constant tension. Being symbolic it is arbitrarily perfectible; but also it is arbitrarily changeable.
It is easier to change the specification to fit the program than vice versa.
Fools ignore complexity. Pragmatists suffer it. Some can avoid it. Geniuses remove it.
In English every word can be verbed. Would that it were so in our programming languages.
Dana Scott is the Church of the Lattice-Way Saints.
In programming, as in everything else, to be in error is to be reborn.
In computing, invariants are ephemeral.
When we write programs that "learn", it turns out we do and they don't.
Often it is means that justify ends: Goals advance technique and technique survives even when goal structures crumble.
Make no mistake about it: Computers process numbers - not symbols. We measure our understanding (and control) by the extent to which we can arithmetize an activity.
Making something variable is easy. Controlling ration of constancy is the trick.
Think of all the psychic energy expended in seeking a fundamental distinction between "algorithm" and "program".
If we believe in data structures, we must believe in independent (hence simultaneous) processing. For why else would we collect items within a structure? Why do we tolerate languages that give us the one without the other?
In a 5 year period we get one superb programming language. Only we can't control when the 5 year period will begin.
Over the centuries the Indians developed sign language for communicating phenomena of interest. Programmers from different tribes (FORTRAN, LISP, ALGOL, SNOBOL, etc.) could use one that doesn't require them to carry a blackboard on their ponies.
Documentation is like term insurance: It satisfies because almost no one who subscribes to it depends on its benefits.
An adequate bootstrap is a contradiction in terms.
It is not a language's weaknesses but its strengths that control the gradient of its change: Alas, a language never escapes its embryonic sac.
It is possible that software is not like anything else, that it is meant to be discarded: that the whole point is to always see it as soap bubble?
Because of its vitality, the computing field is always in desperate need of new cliches: Banality soothes our nerves.
It is the user who should parameterize proceres, not their creators.
The cybernetic exchange between man, computer and algorithm is like a game of musical chairs: The frantic search for balance always leaves one of the three standing ill at ease.
『叄』 C語言編程中if語句的格式是什麼
if是我們比較常用的條件語句，根據true或者false選擇要執行的語句，形式一般是這樣的：
if（條件表達式1）
{
條件表達式1為true時執行的語句序列
}
else if(條件表達式2）
{
條件表達式2為true時執行的語句序列
}
...（還可以加else if(條件表達式3，4，5等），else本身有「也」的意思）
else
{
所有條件表達式為false時執行的語句序列
}
需要注意的是：else應該與最近的if語句匹配。
『肆』 C語言編程的常用語句及其作用
C語言控制語句①條件語句：if—else語句
②開關語句：switch語句
⑧當循環語句：while語句
④直到循環語句：do—while語句
⑤計數循環語句：for·語句
⑥中止本次循環語句：continue語句
⑦中止整個循環語句：break語句
⑧函數返回語句：return語句
⑨無條件轉移語句：goto語句 C語言的關鍵字共有32個，根據關鍵字的作用，可分其為數據類型關鍵字、控制語句關鍵字、存儲類型關鍵字和其它關鍵字四類。
1 數據類型關鍵字（12個）： (1) char ：聲明字元型變數或函數
(2) double ：聲明雙精度變數或函數
(3) enum ：聲明枚舉類型
(4) float：聲明浮點型變數或函數
(5) int： 聲明整型變數或函數
(6) long ：聲明長整型變數或函數
(7) short ：聲明短整型變數或函數
(8) signed：聲明有符號類型變數或函數
(9) struct：聲明結構體變數或函數
(10) union：聲明共用體（聯合）數據類型
(11) unsigned：聲明無符號類型變數或函數
(12) void ：聲明函數無返回值或無參數，聲明無類型指針（基本上就這三個作用）
2控制語句關鍵字（12個）： A循環語句
(1) for：一種循環語句(可意會不可言傳）
(2) do ：循環語句的循環體
(3) while ：循環語句的循環條件
(4) break：跳出當前循環
(5) continue：結束當前循環，開始下一輪循環
B條件語句
(1)if: 條件語句
(2)else ：條件語句否定分支（與 if 連用）
(3)goto：無條件跳轉語句
C開關語句
(1)switch :用於開關語句
(2)case：開關語句分支
(3)default：開關語句中的「其他」分支
D返回語句
return ：子程序返回語句（可以帶參數，也看不帶參數）
3 存儲類型關鍵字（4個） (1)auto ：聲明自動變數 一般不使用
(2)extern：聲明變數是在其他文件正聲明（也可以看做是引用變數）
(3)register：聲明積存器變數
(4)static ：聲明靜態變數 4 其它關鍵字（4個）： (1)const ：聲明只讀變數
(2)sizeof：計算數據類型長度
(3)typedef：用以給數據類型取別名（當然還有其他作用
(4)volatile：說明變數在程序執行中可被隱含地改變
『伍』 pl/sql編程中有哪些控制語句
像編程語言一樣，oracle PL/SQL也有自己的流程式控制制語句。通過流程式控制制語句，我們可以在PL/SQL中實現一下比較復雜的業務邏輯操作。而無需到程序中去控制，在一定程度上提高了效率，這也是PL/SQL的強大之處。PL/SQL流程式控制制語句有如下幾種：
控制語句: 包括IF 語句、CASE語句
循環語句: 包括LOOP語句, WHILE語句、FOR語句
順序語句: 包括GOTO語句
二、語句種類
1、控制語句
a、IF語句
語法如下：
IF 條件語句 TEHN 執行語句
ELSIF 條件語句 TEHN 執行語句
ELSE 執行語句
END IF;
示例如下：
DECLARE
i number;
str VARCHAR2(18) := 'b';
BEGIN
--數字判斷
if(i = 6) THEN
NULL; -- 如果什麼都不做建議寫null，保證語句的完整性