CODEWITHSUNDEEP
c++stringstringstream
Goles
Goles

Reputation: 11799

How to use C++ String Streams to append int?

could anyone tell me or point me to a simple example of how to append an int to a stringstream containing the word "Something" (or any word)?

Upvotes: 14

Views: 34398

Answers (3)

Jerry Coffin
Jerry Coffin

Reputation: 490098

I'd probably do something on this general order:

#include <string>
#include <sstream>
#include <iostream>

int main() {      
    std::stringstream stream("Something ");

    stream.seekp(0, std::ios::end);
    stream << 12345;

    std::cout << stream.str();
    return 0;
}

With a normal stream, to add to the end, you'd open with std::ios::ate or std::ios::app as the second parameter, but with string streams, that doesn't seem to work dependably (at least with real compilers -- neither gcc nor VC++ produces the output I'd expect when/if I do so).

Upvotes: 3

KeithB
KeithB

Reputation: 17007

If you are already using boost, it has lexical_cast that can be be used for this. It is basically a packaged version of the above, that works on any type that can be written to and read from a stream.

string s("something");

s += boost::lexical_cast<string>(12);

Its probably not worth using if you aren't using boost already, but if you are it can make your code clearer, especially doing something like

foo(string("something")+boost::lexical_cast<string>(12));

Upvotes: 1

Daniel A. White
Daniel A. White

Reputation: 190907

stringstream ss;
ss << "Something" << 42;

For future reference, check this out.

http://www.cplusplus.com/reference/iostream/stringstream/

Upvotes: 18

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