[英]Splitting strings by newline character in C++
If I have two tables stored in std::string
variables, how could I display them side-by-side?如果我有两个表存储在std::string
变量中,我如何并排显示它们? In particular...特别是...
I have std::string table1
which contains the following:我有std::string table1
,其中包含以下内容:
X | Y
-------
2 | 3
1 | 3
5 | 2
I have std::string table2
which contains the following:我有std::string table2
包含以下内容:
X | Y
-------
1 | 6
1 | 1
2 | 1
3 | 5
2 | 3
I need to modify them (or really just print them to standard output) so that the following appears:我需要修改它们(或者真的只是将它们打印到标准输出),以便出现以下内容:
X | Y X | Y
------- -------
2 | 3 1 | 6
1 | 3 1 | 1
5 | 2 2 | 1
3 | 5
2 | 3
In other words, I have two tables stored in std::string
variables with newline characters separating the rows.换句话说,我有两个表存储在std::string
变量中,换行符分隔行。
I would like to print them to screen (using std::cout
) so that the tables appear side-by-side, vertically aligned at the top.我想将它们打印到屏幕上(使用std::cout
),以便表格并排显示,在顶部垂直对齐。 How could I do this?我怎么能这样做?
For example, if I could do something like std::cout << table1.nextToken('\\n')
where nextToken('\\n')
gives the next token and tokens are separated by the '\\n'
character, then I could devise a method to cycle through all tokens, and once all of table1
tokens are used, I could then simply print space characters so that the remaining tokens of table2
are properly horizontally aligned.例如,如果我可以执行类似std::cout << table1.nextToken('\\n')
,其中nextToken('\\n')
给出下一个标记,并且标记由'\\n'
字符分隔,那么我可以设计一种方法来循环遍历所有标记,一旦使用了所有table1
标记,我就可以简单地打印空格字符,以便table2
的其余标记正确水平对齐。 But, such a nextToken(std::string)
function does not exist --- I don't know of it, at least.但是,这样的nextToken(std::string)
函数不存在——至少我不知道。
Key words: istringstream, getline关键词:istringstream、getline
Implementaion:实施:
#include <iostream>
#include <sstream>
int main()
{
std::string table1 =
" X | Y\n"
"-------\n"
" 2 | 3\n"
" 1 | 3\n"
" 5 | 2\n";
std::string table2 =
" X | Y\n"
"-------\n"
" 1 | 6\n"
" 1 | 1\n"
" 2 | 1\n"
" 3 | 5\n"
" 2 | 3\n";
std::istringstream streamTable1(table1);
std::istringstream streamTable2(table2);
while (!streamTable1.eof() || !streamTable2.eof())
{
std::string s1;
getline(streamTable1, s1);
while (s1.size() < 9)
s1 += " ";
std::string s2;
getline(streamTable2, s2);
std::cout << s1 << s2 << std::endl;
}
}
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