How do I concatenate int variables?

[Vitesze]

I have something like:

int MCC, MND, LAC, CID;

void loop()

MCC = (towerInfo->mobileCountryCode);
MNC = (towerInfo->mobileNetworkCode);
LAC = (towerInfo->locationAreaCode);
CID = (towerInfo->cellId);

In which, the output is something like, MCC: 250, MNC: 580, LAC: 68900, CID: 2350456.

I want a variable (e.g. CELL) that looks something like 250-580-68900-2350456. How do I do this? I've been looking for ages and trying out a lot of stuff, but can't quite find a solution to what seems like a simple-to-solve problem.

[jonnin]

integers are just bits. That is all. Any formatting you will have to do yourself. To do these things you may have to drop the int into a string, or store 4 integers and print them together.
eg
int dashed[4] = {250,580,68900,2350456};
cout << dashed[0] <<'-' << dashed[1]<<'-' ... etc

[Vitesze]

I don't quite follow. I want to something like a string-variable that stores these values. I don't just want to have it printed.

[mbozzi]

See std::to_string():
http://en.cppreference.com/w/cpp/string/basic_string/to_string

[Vitesze]

Any way to do it without <iostream> and <stream>? Due to the file size of these libraries I rather not use them. My code is about 24kb, with the inclusion of these libraries it suddenly peaked to 105kb.

[mbozzi]

std::to_string is defined in the header <string>.

There is no standard library header named stream. (Maybe you meant sstream.)

If you don't want to use the STL strings (e.g., for code size purposes), you may also find std::itoa in <cstdlib>. But this is non-standard.
https://www.mkssoftware.com/docs/man3/itoa.3.asp

Also, std::sprintf() (should be preferred over itoa):
http://en.cppreference.com/w/cpp/io/c/fprintf

[Vitesze]

Any way you could give a simple example of how I should embed this in my code? To make it even easier:

int LAC, CID;
String CELL;

LAC = (towerInfo->locationAreaCode); // 68900
CID = (towerInfo->cellId; // 2350456

Output-wanted is something like CELL = 68900-2350456




I assume it's something like:

#include <stdlib.h>
int LAC, CID;
String CELL;

LAC = (towerInfo->locationAreaCode);
CID = (towerInfo->cellId;
itoa (LAC, LACstr, 10);
itoa (CID, CIDstr, 10);

After that, would I be able to concatenate, doing something like CELL = ''LACstr'' + ''-'' + ''CIDstr''?



Apologies for the dumb questions; I literally have no prior experience with any coding.

[Duthomhas]

Streams are what you use in C++ to convert between strings and other things.

#include <sstream>
#include <string> 

std::string& make_cell_number( TowerInfo* towerInfo )
{
  std::ostringstream ss;
  ss << towerInfo->mobileCountryCode << "-"
     << towerInfo->mobileNetworkCode) << "-"
     << towerInfo->locationAreaCode) << "-"
     << towerInfo->cellId;
  return ss.str();
}

Hope this helps.

[mbozzi]

To concatenate C-strings you need to use std::strcat. Obviously std::strings are preferred, so you don't have to do that.

Using only <cstdio>:

static constepxr int max_sz = 64;
char output[max_sz];
int const result = std::sprintf(output, max_sz, "CELL = %d-%d", LAC, CID);
if (result < 0 || result >= max_sz) { /* handle error */ }; 

Using only <string>:

std::string const result = "CELL = " + std::to_string(LAC) + "-" + std::to_string(CID);

I literally have no prior experience with any coding.

I'm surprised.