C++ 将字符串拆分为数组
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Split a string into an array in C++
提问by Ahoura Ghotbi
Possible Duplicate:
How to split a string in C++?
可能的重复：
如何在 C++ 中拆分字符串？
I have an input file of data and each line is an entry. in each line each "field" is seperated by a white space " " so I need to split the line by space. other languages have a function called split (C#, PHP etc) but I cant find one for C++. How can I achieve this? Here is my code that gets the lines:
我有一个数据输入文件，每一行都是一个条目。在每一行中，每个“字段”都由一个空格“”分隔，所以我需要按空格分割行。其他语言有一个名为 split（C#、PHP 等）的函数，但我找不到用于 C++ 的函数。我怎样才能做到这一点？这是我获取行的代码：
string line;
ifstream in(file);
while(getline(in, line)){
// Here I would like to split each line and put them into an array
}
回答by Nawaz
#include <sstream> //for std::istringstream
#include <iterator> //for std::istream_iterator
#include <vector> //for std::vector
while(std::getline(in, line))
{
std::istringstream ss(line);
std::istream_iterator<std::string> begin(ss), end;
//putting all the tokens in the vector
std::vector<std::string> arrayTokens(begin, end);
//arrayTokens is containing all the tokens - use it!
}
By the way, use qualified-names such as std::getline, std::ifstreamlike I did. It seems you've written using namespace stdsomewhere in your code which is considered a bad practice. So don't do that:
顺便说一句，像我一样使用限定名称std::getline，std::ifstream例如 。您似乎using namespace std在代码中的某处编写了被认为是不好的做法。所以不要这样做：
回答by Benjamin Lindley
vector<string> v;
boost::split(v, line, ::isspace);
http://www.boost.org/doc/libs/1_48_0/doc/html/string_algo/usage.html#id3115768
http://www.boost.org/doc/libs/1_48_0/doc/html/string_algo/usage.html#id3115768
回答by Vijay
I have written a function for a similar requirement of mine, maybe you can use it!
我已经为我的类似需求编写了一个函数，也许你可以使用它！
std::vector<std::string> &split(const std::string &s, char delim, std::vector<std::string> &elems)
{
std::stringstream ss(s+' ');
std::string item;
while(std::getline(ss, item, delim))
{
elems.push_back(item);
}
return elems;
}
回答by Software_Designer
The code below uses strtok()to split a string into tokens and stores the tokens in a vector.
下面的代码用于strtok()将字符串拆分为标记并将标记存储在向量中。
#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
using namespace std;
char one_line_string[] = "hello hi how are you nice weather we are having ok then bye";
char seps[] = " ,\t\n";
char *token;
int main()
{
vector<string> vec_String_Lines;
token = strtok( one_line_string, seps );
cout << "Extracting and storing data in a vector..\n\n\n";
while( token != NULL )
{
vec_String_Lines.push_back(token);
token = strtok( NULL, seps );
}
cout << "Displaying end result in vector line storage..\n\n";
for ( int i = 0; i < vec_String_Lines.size(); ++i)
cout << vec_String_Lines[i] << "\n";
cout << "\n\n\n";
return 0;
}
回答by Tristram Gr?bener
C++ is best used with the almost-standard-library boost.
C++ 最好与几乎标准的库提升一起使用。
And an example : http://www.boost.org/doc/libs/1_48_0/doc/html/string_algo/usage.html#id3115768
和一个例子：http: //www.boost.org/doc/libs/1_48_0/doc/html/string_algo/usage.html#id3115768
回答by jli
Either use a stringstreamor read token by token from your ifstream.
无论是使用stringstream还是从通过令牌读取令牌ifstream。
To do it with a stringstream:
要使用字符串流来做到这一点：
string line, token;
ifstream in(file);
while(getline(in, line))
{
stringstream s(line);
while (s >> token)
{
// save token to your array by value
}
}
