How to add integer in a string?

Question

I want to append integer value with string value but not a variable.

I tried to put an integer value which is variable with a string called February. I tried it using += operator but it did not work.

string getMonth(day)
{
      if(day >=31 ){
          day -= 31;
          "February "+=day;
      }
}

Answer 1

Do something like

#include <string>

// ...

std::string s( "February " );

s += std::to_string( day );

Here is a demonstrative program

#include <iostream>
#include <string>

int main()
{
    std::string s( "February " );

    int day = 20;

    s += std::to_string( day );

    std::cout << s << '\n';
}

Its output is

February 20

Another approach is to use a string stream.

Here is one more demonstrative program.

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

int main()
{
    std::ostringstream oss;
    int day = 20;

    oss << "February " << day;

    std::string s = oss.str();

    std::cout << s << '\n';
}

Its output is the same as shown above.

Answer 2

The answer above solved my problem.. If you are using dev c++ like me then you might be in the same problem, I would recommend you to add -std=c++11. For this you can got to this link How to change mode from c++98 mode in Dev-C++ to a mode that supports C++0x (range based for)? and go to second answer. Thank you