Adding variables and text to a string?

Question

Is there a way to make a string grab a set text and a variable? Something like this:

std::string morning = "morning";
std::string str = "Good " [insert morning here] ", user!";

Obviously I'm trying to do something a bit more complex than the example I just gave, but I believe you can kinda understand what I'm trying to do.

Thanks in advance, guys!

do you want to concatenate strings? Or string with numbers too? — zoska
– zoska, Commented Feb 10, 2015 at 17:19
Which C++ book are you using? String concatenation is fairly basic. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Feb 14, 2015 at 17:48

Paul Evans · Accepted Answer · 2015-02-10 16:34:17Z

2

You simply use std::string::operator+, something like:

std::string str = "Good " + morning + ", user!";

answered Feb 10, 2015 at 16:34

Paul Evans

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Thomas Matthews · Accepted Answer · 2015-02-10 16:42:29Z

1

Another method is to use std::ostringstream:

std::string morning = "morning";
unsigned int user_id = 384;
std::ostringstream out_stream;
out_stream << "Good " << morning << ", user #" << user_id;
std::string str = out_stream.str();

answered Feb 10, 2015 at 16:42

Thomas Matthews

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user4490718 · Accepted Answer · 2015-02-14 17:44:18Z

0

Unfortunately neither ostream nor the operator+ worked. I ended using some char and push_back stuff. Anyway, thanks guys!

answered Feb 14, 2015 at 17:44

user4490718

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