CODEWITHSUNDEEP
c++
Lion King
Lion King

Reputation: 33813

How to joining 2 variables in other variable

See the example to understand

int rnd = rand() %10;
string Folder = "c://foldername";
string final_name = Folder + rnd; // here the target

/* I want the result like that (random folder name)
foldername5
foldername10
foldername3
foldername20
foldername17
*/

Upvotes: 0

Views: 62

Answers (5)

Sarfaraz Nawaz
Sarfaraz Nawaz

Reputation: 361302

Use std::stringstream as:

#include <sstream> //include this

std::stringstream ss;
ss << Folder  << rnd;
string final_name = ss.str();

Or you can write this just in one line:

string final_name = stringbuilder() << Folder  << rnd;

All that it needs a small utility class:

struct stringbuilder
{
   std::stringstream ss;
   template<typename T>
   stringbuilder & operator << (const T &data)
   {
        ss << data;
        return *this;
   }
   operator std::string() { return ss.str(); }
};

Using this class, you can create std::string on the fly as:

void f(const std::string & file ) {}

f(stringbuilder() << Folder  << rnd);

std::string s = stringbuilder() << 25  << " is greater than " << 5 ;

Upvotes: 3

Siva Charan
Siva Charan

Reputation: 18064

Convert rnd (it is in integer type) to string type then do the same

string final_name = Folder + rnd;

Upvotes: -1

Kerrek SB
Kerrek SB

Reputation: 476950

Say this:

std::string final_name = Folder + std::to_string(rnd);

If you have an old compiler that doesn't support C++11, you can use boost::lexical_cast, or std::snprintf, or string streams.

Upvotes: 2

RedX
RedX

Reputation: 15165

In c++ you use stringstream to convert integers to strings.

int rnd = rand() %10;
string Folder = "c://foldername";
stringstream ss;
ss << Folder << rnd;
string final_name = ss.str(); // here the target

Upvotes: 2

Constantinius
Constantinius

Reputation: 35039

In C++ the best way to do this is to use a stringstream:

#include<sstream>

...

std::stringstream stream;
stream << "c://foldername" << rand() %10;
stream.str(); // now contains both path and number

Upvotes: 2

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