C++ 尾随空格是什么意思，它和空格有什么区别？
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what is meant by trailing space and what's the difference between it and a blank?
提问by user12448
What is meant by trailing space and what's the difference between it and a blank ? I saw an exercise where there is a note about trailing space.
尾随空格是什么意思，它和空格有什么区别？我看到一个练习，其中有关于尾随空格的注释。
I didn't see the problem on that because cincan ignore those spaces and catch only numbers ?
我没有看到问题，因为cin可以忽略这些空格并只捕获数字？
回答by LeonardBlunderbuss
Trailing space is all whitespacelocated at the end of a line, without any other characters following it. This includes spaces (what you called a blank) as well as tabs \t, carriage returns \r, etc. There are 25 unicode characters that are considered whitespace, which are listed on Wikipedia.
尾随空格是位于行尾的所有空白，其后没有任何其他字符。这包括空格（您称之为空格）以及制表符\t、回车符\r等。有 25 个 unicode 字符被视为空格，列在Wikipedia 上。
回答by 2785528
what's the difference between [trailing space] and a blank?
[尾随空格]和空格有什么区别？
A blank at the end of a line is a trailing space. A blank between characters (or words, or digits) is not a trailing space.
行尾的空白是尾随空格。字符（或单词或数字）之间的空格不是尾随空格。
what is meant by trailing space?
尾随空格是什么意思？
Trailing space became a challenge for me for something I was trying to code. The challenge inspired me to create the following utility routines. For this particular effort, I defined "trailing space" as any "white space" at the end of a line. (Yes, I also created versions of this function for leading white space, and extra white space (more than 1 white space character in the middle of the line.)
对于我试图编码的东西，拖尾空间对我来说是一个挑战。这个挑战激励我创建以下实用程序。对于这项特殊的工作，我将“尾随空间”定义为行尾的任何“空白”。（是的，我还创建了这个函数的版本，用于前导空格和额外的空格（行中间超过 1 个空格字符。）
const char* DTB::whitespaces = "\t\n\v\f\r ";
// 0 1 2 3 4 5
// 0)tab, 1)newline, 2)vertical tab, 3)formfeed, 4)return, 5)space,
void DTB::trimTrailingWhiteSpace(std::string& s)
{
do // poor man's try block
{
if(0 == s.size()) break; // nothing to trim, not an error or warning
// search from end of s until no char of 'whitespaces' is found
size_t found = s.find_last_not_of(DTB::whitespaces);
if(std::string::npos == found) // none found, so s is all white space
{
s.erase(); // erase the 'whitespace' chars, make length 0
break;
}
// found index to last not-whitespace-char
size_t trailingWhitespacesStart = found + 1; // point to first of trailing whitespace chars
if(trailingWhitespacesStart < s.size()) // s has some trailing white space
{
s.erase(trailingWhitespacesStart); // thru end of s
break;
}
}while(0);
} // void trimTrailingWhiteSpace(std::string& s)
回答by Marco A.
A trailing space in programming (as I think you're referring) it's a series of whitespaces at the end of a string or a line.
编程中的尾随空格（我认为您指的是）它是字符串或行末尾的一系列空格。
They can cause some hassle under the following circumstances:
在以下情况下，它们可能会引起一些麻烦：
You might have a string literal spanning multiple lines, in that case it can be tricky to debug a trailing whitespace
Can slow the development process when you always have to "fix" those by hand when you have to type-append on a line
Some parsing tools might have problems with them
您可能有一个跨越多行的字符串文字，在这种情况下，调试尾随空格可能会很棘手
当您必须在一行上键入附加时，您总是必须手动“修复”它们，这可能会减慢开发过程
一些解析工具可能有问题
