Simple C++ - about strings and concatenation and converting int to string [duplicate]

Answer 1

for (int i=0; i<23; i++)
{
    imagelist.push_back("C:/x/left"+std::to_string(i)+".bmp");
    imagelist.push_back("C:/x/right"+std::to_string(i)+".bmp");
}

Answer 2

One solution is to use stringstreams:

#include<sstream>

for (int i=0; i<23; i++)
{
    stringstream left, right;
    left << "C:/x/left" << i << ".bmp";
    right << "C:/x/left" << i << ".bmp";
    imagelist.push_back(left.str());
    imagelist.push_back(right.str());
}

stringstream is not the faster in performance solution, but is easy to understand and very flexible.

Another option is to use itoa and sprintf, if you feel at home with c style printing. However, I have heard that itoa is not very portable function.

Answer 3

std::ostringstream os;
os << "C:/x/left" << i << ".bmp";
imagelist.push_back(os.str());