编程中的语句
‘壹’ C语言程序中的语句都用什么作为结束符
C语言规定，语句的结束符用分号(；)来进行标识。
C语言中语句分为简单语句（simple statement）和复合语句（compound statement）。
简单语句以分号作尺迅笑为结束。其中简单语句里陵含面又有赋值语句、声明语句、结构化语句、函数调用语句和 空语句。复合语句指用花昌戚括号{ } 将简单语句甚至另一些复合包起来，所以就以}作为语句结束的标记。
‘贰’ 有哪些和编程有关的经典语句
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.
‘叁’ C语言编程中if语句的格式是什么
if是我们比较常用的条件语句，根据true或者false选择要执行的语句，形式一般是这样的：
if（条件表达式1）
{
条件表达式1为true时执行的语句序列
}
else if(条件表达式2）
{
条件表达式2为true时执行的语句序列
}
...（还可以加else if(条件表达式3，4，5等），else本身有“也”的意思）
else
{
所有条件表达式为false时执行的语句序列
}
需要注意的是：else应该与最近的if语句匹配。
‘肆’ C语言编程的常用语句及其作用
C语言控制语句①条件语句：if—else语句
②开关语句：switch语句
⑧当循环语句：while语句
④直到循环语句：do—while语句
⑤计数循环语句：for·语句
⑥中止本次循环语句：continue语句
⑦中止整个循环语句：break语句
⑧函数返回语句：return语句
⑨无条件转移语句：goto语句 C语言的关键字共有32个，根据关键字的作用，可分其为数据类型关键字、控制语句关键字、存储类型关键字和其它关键字四类。
1 数据类型关键字（12个）： (1) char ：声明字符型变量或函数
(2) double ：声明双精度变量或函数
(3) enum ：声明枚举类型
(4) float：声明浮点型变量或函数
(5) int： 声明整型变量或函数
(6) long ：声明长整型变量或函数
(7) short ：声明短整型变量或函数
(8) signed：声明有符号类型变量或函数
(9) struct：声明结构体变量或函数
(10) union：声明共用体（联合）数据类型
(11) unsigned：声明无符号类型变量或函数
(12) void ：声明函数无返回值或无参数，声明无类型指针（基本上就这三个作用）
2控制语句关键字（12个）： A循环语句
(1) for：一种循环语句(可意会不可言传）
(2) do ：循环语句的循环体
(3) while ：循环语句的循环条件
(4) break：跳出当前循环
(5) continue：结束当前循环，开始下一轮循环
B条件语句
(1)if: 条件语句
(2)else ：条件语句否定分支（与 if 连用）
(3)goto：无条件跳转语句
C开关语句
(1)switch :用于开关语句
(2)case：开关语句分支
(3)default：开关语句中的“其他”分支
D返回语句
return ：子程序返回语句（可以带参数，也看不带参数）
3 存储类型关键字（4个） (1)auto ：声明自动变量 一般不使用
(2)extern：声明变量是在其他文件正声明（也可以看做是引用变量）
(3)register：声明积存器变量
(4)static ：声明静态变量 4 其它关键字（4个）： (1)const ：声明只读变量
(2)sizeof：计算数据类型长度
(3)typedef：用以给数据类型取别名（当然还有其他作用
(4)volatile：说明变量在程序执行中可被隐含地改变
‘伍’ pl/sql编程中有哪些控制语句
像编程语言一样，oracle PL/SQL也有自己的流程控制语句。通过流程控制语句，我们可以在PL/SQL中实现一下比较复杂的业务逻辑操作。而无需到程序中去控制，在一定程度上提高了效率，这也是PL/SQL的强大之处。PL/SQL流程控制语句有如下几种：
控制语句: 包括IF 语句、CASE语句
循环语句: 包括LOOP语句, WHILE语句、FOR语句
顺序语句: 包括GOTO语句
二、语句种类
1、控制语句
a、IF语句
语法如下：
IF 条件语句 TEHN 执行语句
ELSIF 条件语句 TEHN 执行语句
ELSE 执行语句
END IF;
示例如下：
DECLARE
i number;
str VARCHAR2(18) := 'b';
BEGIN
--数字判断
if(i = 6) THEN
NULL; -- 如果什么都不做建议写null，保证语句的完整性