陈述和表达的概念 [英] Concept of Statements and Expressions
问题描述
您好，我想知道语句的严肃定义
和表达式是：
i知道表达式被计算为一个值，即：
1 == 2
5 + 7
foo（1,2）
并执行声明：
休息;
5 + 7;
if（foo（1,2））{...}
但是......
C标准如何定义语句和表达式？
表达式语句怎么样？
TIA
Hello, i would like to know what the serious definition of statements
and expressions is:
i know an expression are evaluated to a value, i.e:
1 == 2
5+7
foo( 1,2)
and a statement is executed:
break;
5+7;
if( foo(1,2) ){ ... }
but...
How does the C standard define Statements and Expressions??
And what about expression statements?
TIA
推荐答案
Neroku写道：
Neroku wrote:
您好，我想知道语句
和表达式的严肃定义是什么：
我知道表达式被计算为一个值，即：
1 == 2
5 + 7
foo（1,2）
并执行一条陈述：
休息;
5 + 7;
if（foo（1,2））{...}
但......
C标准如何定义语句和表达式sions ??
那些表达式语句呢？
Hello, i would like to know what the serious definition of statements
and expressions is:
i know an expression are evaluated to a value, i.e:
1 == 2
5+7
foo( 1,2)
and a statement is executed:
break;
5+7;
if( foo(1,2) ){ ... }
but...
How does the C standard define Statements and Expressions??
And what about expression statements?
6.5p1表达式
表达式是一系列运算符和操作数指定
计算一个
值，或者指定一个对象或一个函数，或者生成
副作用，或者
执行其组合。 [...]
6.8p2语句和块
语句指定要执行的操作。 [...]
寻找N1124.pdf以查看其余的定义。这里要粘贴很多
。
6.5p1 Expressions
An expression is a sequence of operators and operands that specifies
computation of a
value, or that designates an object or a function, or that generates
side effects, or that
performs a combination thereof. [...]
6.8p2 Statements and blocks
A statement specifies an action to be performed. [...]
Look for N1124.pdf to see the rest of the definitions. There''s to much
to paste here.
Vladimir Oka写道：
Vladimir Oka wrote:
6.5p1表达式
表达式是一系列运算符和操作数，用于指定
值的计算，或指定对象或函数，或生成
副作用，或
执行其组合。 [...]
6.5p1 Expressions
An expression is a sequence of operators and operands that specifies
computation of a
value, or that designates an object or a function, or that generates
side effects, or that
performs a combination thereof. [...]
包括看不见的操作员。
-
pete
That includes the invisible operator.
--
pete
" Vladimir Oka" <无**** @ btopenworld.com>写道：
"Vladimir Oka" <no****@btopenworld.com> writes:
Neroku写道：
您好，我想知道陈述
和表达的严肃定义是什么：
我知道一个表达式被评估为一个值，即：
1 == 2
5 + 7
foo（1,2）
并执行一个语句：
休息;
5 + 7;
if（foo（1,2））{...}
但是...
如何C标准是否定义了语句和表达式？
那么表达式语句呢？
Hello, i would like to know what the serious definition of statements
and expressions is:
i know an expression are evaluated to a value, i.e:
1 == 2
5+7
foo( 1,2)
and a statement is executed:
break;
5+7;
if( foo(1,2) ){ ... }
but...
How does the C standard define Statements and Expressions??
And what about expression statements?
6.5p1表达式
表达式是一系列运算符和操作数，用于指定
值的计算，或指定对象或功能，或产生副作用，或执行其组合的值。 [...]
6.5p1 Expressions
An expression is a sequence of operators and operands that specifies
computation of a value, or that designates an object or a function,
or that generates side effects, or that performs a combination
thereof. [...]
这个定义实际上是不准确的。例如，
显然是一个表达式，但它不包含运算符，因此
没有操作数。 （不，没有隐含的隐形算子。）
-
基思汤普森（The_Other_Keith） ks *** @ mib.org < http://www.ghoti.net/~kst>
圣地亚哥超级计算机中心< *> ; < http://users.sdsc.edu/~kst>
我们必须做点什么。这是事情。因此，我们必须这样做。
This definition is actually inaccurate. For example,
42
is clearly an expression, but it contains no operators and therefore
no operands. (No, there''s no implicit invisible operator.)
--
Keith Thompson (The_Other_Keith) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.
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