Question

whats the best way of creating a ‘const char*’ using available variables? For example, a function requires a const char* as a parameter to locate a file i.e. “invader1.png”. If I have 5 different invader images, how can I iterate from 1:5 so “Invader1.png”..”Invader2.png..etc etc
so i want “invader” + %d + “.png”

i tried sprintf and casting but to no avail.

I hope my description makes sense, thanks

update with code:

 for (int y=0; y<250; y+=50){
            stringstream ss;
            ss << "invader" << (y/50) << ".png";
            const char* rr = ss.str().c_str();
            printf("%s", rr);
            for (int x=0; x<550;x+=50){
                Invader inv(rr, x+50, y+550, 15, 15, 1, false, (y/50 + 50));
                invaders[i] = inv;
                i++;
            }
        }

Answer 1

Use std::stringstream. Something like this:

std::stringstream ss;
ss << "invader" << my_int << ".png";
my_func(ss.str().c_str());