Building a String for a param? C++

[Xilef]

I have a function:

config.read<int>("input");

How would I do this in C++:

for (int i = 0; i < 128; i++)

{

 config.read<int>(i + "input");

}

I want to parse the input as 0input, 1input, 2input, etc, through to 127input.

What's the easiest way to do this?

 

[Brewmeister]

something like...

 char inpt [4];

for (int i = 0; i < 128; i++)

{

 sprintf(inpt,"%d%s",i,"input");

 config.read<int>(inpt);

}

You could also use itoa to convert i to a string, but it's less portable than sprintf

 

[Xilef]

It worked! Thanks.

 

[DeM0nFiRe]

Just to clear things up a bit, sprintf is not C++, it's C. If you want to be particular, the C++ way of doing things is to use a stream. Here's a bit on why you should use streams instead of sprintf in C++ http://en.wikipedia.org/wiki/Sprintf#C. ... conversion

The way you would do it is create a string stream, send i to the stream, then send "input" to the stream, and then get your string from there.

would look something like

 

for(int i = 0; i < 128; ++i){

    std::stringstream mystream;

    mystream << i;

    mystream << "input";

    yourfunction(mystream.str().c_str());

}

 

That might not be exactly right, it's almost 3AM :D You also have to do some includes, I think you need <sstream> and <string>?

My guess would be that sprintf is faster in this case, but it's also not the most "right" way of doing it. In the short term, neither speed nor correctness are likely to affect this program, but it's better to learn the right way because you can optimize later. It's best not to optomize until you know why you are optimizing! :D

 

[Xilef]

I'll keep this in mind, for now I'm just trying to develop an end product.