语句和功能之间的区别 [英] Difference between statement and function

问题描述

快到午夜了，我脑子里只有一个问题是for loop一个声明或一个函数。

It's almost midnight and I just got a question in my head is "for loop" a statement or a function.

我一直认为这是一个声明，但是我做了谷歌搜索它是一个功能，确实有结果。那是什么？在那种情况下，函数和语句之间的区别是什么？

I always thought it is a statement, but I did a google search on it being a function and there are indeed results for that. So what is it? And in that case what is the difference between function and statement?

推荐答案

for循环通常不是函数，它是一种称为流量控制结构的特殊语句。

A for loop is a not usually a function, it is a special kind of statement called a flow control structure.

A 声明 是一个命令。它做了一些事情。在大多数语言中，语句不返回值。示例：

A statement is a command. It does something. In most languages, statements do not return values. Example:

print "Hello World"

功能 是一个子程序，可以在程序的其他地方调用。函数通常（但不一定）返回值。示例：

A function is a subroutine that can be called elsewhere in the program. Functions often (but not necessarily) return values. Example:

function(a) { return a * 2 }

控制结构 ，也称为复合语句，是一种用于指导执行流程的语句。示例：

A control structure, also known as a compound statement, is a statement that is used to direct the flow of execution. Examples:

if (condition) then { branch_1 } else { branch_2 }

for (i = 0; i < 10; i += 1) { ... }

另外值得注意的是 表达式 是一段评估为值的代码。示例：

Also worth noting is that an expression is a piece of code that evaluates to a value. Example:

2 + 2

所有示例都是伪代码，不依赖于任何特定语言。另请注意，这些不是独家类别，它们可以重叠。

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