什么是 C++ 中的“文字”？
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What is a "literal" in C++?
提问by Amani
Possible Duplicate:
What does the word “literal” mean?
可能的重复：
“文字”这个词是什么意思？
Often when reading literature about C++, I encounter the word "literal". It is a bit unclear to me what exactly this term means in C++.
通常在阅读有关 C++ 的文献时，我会遇到“文字”这个词。我有点不清楚这个术语在 C++ 中的确切含义。
回答by Lightness Races in Orbit
A literal is some data that's presented directly in the code, rather than indirectly through a variable or function call.
文字是一些直接在代码中呈现的数据，而不是通过变量或函数调用间接呈现的。
Here are some examples, one per line:
以下是一些示例，每行一个：
42
128
3.1415
'a'
"hello world"
The data constituting a literal cannot be modified by a program, but it may be copied into a variable for further use:
构成文字的数据不能被程序修改，但可以将其复制到变量中以供进一步使用：
int a = 42; // creates variable `a` with the same value as the literal `42`
This concept is by no means unique to C++.
The term "literal" comes from the fact that you've written data literallyinto your program, i.e. exactly as written, not "hidden" behind a variable name.
术语“文字”来自这样一个事实，即您已将数据按字面意思写入程序，即完全按照所写的方式写入，而不是“隐藏”在变量名后面。
