How do you concatenate strings and integers in C++? [duplicate]

Answer 1

Use std::ostringstream:

std::string name, model;
int year, miles;
...
std::ostringstream os;
os << "Manufacturer's Name: " << name << 
      ", Model Name: " << model <<
      ", Model Year: " << year <<
      ", Miles: " << miles;
std::cout << os.str();               // <-- .str() to obtain a std::string object

Answer 2

std::stringstream s;
s << "Manufacturer's Name: " << name
  << ", Model Name: " << model
  << ", Model Year: " << year
  << ", Miles: " << miles;

s.str();

Answer 3

In C++03, as other people have mentioned, you can use the ostringstream type, defined in <sstream>:

std::ostringstream stream;
stream << "Mixed data, like this int: " << 137;
std::string result = stream.str();

In C++11, you can use the std::to_string function, which is conveniently declared in <string>:

std::string result = "Adding things is this much fun: " + std::to_string(137);

Hope this helps!