Defining variables from split strings?

Question

So, I've made this code, and it basically splits up the users input into different strings.

For example

Workspace.Hello.Hey would then be printed out as "Workspace" "Hello" "Hey"

However, I need to know how to define each of those as their own SEPARATE variable that can be called later on. This is the code I have.

std::string str;
    std::cin >> str;
    std::size_t pos = 0, tmp;
    while ((tmp = str.find('.', pos)) != std::string::npos) {
        str[tmp] = '\0';
        std::cout << "Getting " << str.substr(pos) << " then ";
        pos = tmp;
    }
    std::cout << "Getting " << str.substr(pos) << " then ";

You probably want std::vector<std::string> using push_back to add each string to the vector. — drescherjm
– drescherjm, Commented Dec 28, 2015 at 2:34

Untitled123 · Accepted Answer · 2015-12-28 02:34:35Z

2

C++ has a vectors object in which you can store them in successive indices and access them as you need.

Thinking again on what you're doing, it may be easier to instead feed the string into a stringstream, set . as a delimiter, and then read the contents into a vector of strings as above.

answered Dec 28, 2015 at 2:34

Untitled123

1,3037 silver badges20 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Alec Over a year ago

See this post

Alec · Accepted Answer · 2015-12-31 01:56:59Z

1

Put the substrings in a vector. Here's an example:

std::string str;
std::cin >> str;
std::size_t pos = 0, tmp;
std::vector<std::string> values;
while ((tmp = str.find('.', pos)) != std::string::npos) {
    values.push_back(str.substr(pos, tmp - pos));
    pos = tmp + 1;
}
values.push_back(str.substr(pos, std::string::npos));

for (pos = 0; pos < values.length(); ++pos)
{
    std::cout << "String part " << pos << " is " << values[pos] << std::endl;
}

edited Dec 31, 2015 at 1:56

answered Dec 28, 2015 at 2:38

Alec

6634 silver badges23 bronze badges

1 Comment

Tony Delroy Over a year ago

This solution has an error in the second argument to tmp, which should be a pos-relative count not an absolute offset. That spawned another question and fixed code's available here.

ChrisD · Accepted Answer · 2015-12-28 05:35:39Z

0

You can use Boost to tokenize and split the strings. This approach has the added benefit of allowing you to split on multiple delimeters. (see below):

#include <iostream>
#include <string>
#include <vector>
#include <boost/algorithm/string.hpp>
using namespace std;
using namespace boost;

int main() {
    string text = "Workspace.Hello.Hey";

    vector<string> parts;
    split(parts, text, is_any_of("."));

    for(auto &part : parts) {
        cout << part << " ";
    }
    cout << endl;

    return 0;
}

edited Dec 28, 2015 at 5:35

answered Dec 28, 2015 at 2:54

ChrisD

6746 silver badges15 bronze badges

2 Comments

Untitled123 Over a year ago

Not hugely fond of new libraries when existing features can already do it I am.

ChrisD Over a year ago

@Untitled123 Perhaps, but parsing/splitting a string in C++ can sometimes be a pain without them.

Collectives™ on Stack Overflow

Defining variables from split strings?

3 Answers 3

1 Comment

1 Comment

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

1 Comment

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related