I want to do something like this (showing what FPS im running at in my SDL game):
SDL_WM_SetCaption("FPS: " + GetTicks(&fps)/1000.f, NULL); But Visual Studio intellisens complains that expression must have integral or enum type.
What have i done wrong?
If this really is C++, consider streams;
std::ostringstream str; str << "FPS: " << GetTicks(&fps)/1000.; SDL_WM_SetCaption(str.str().c_str(), NULL); C does not support conversion of simple types (like int or float) to more complex types (like strings).
You should check the sprintf function:
char buffer[64]; sprintf("FPS: %f", GetTicks(&fps)/1000.f); SDL_WM_SetCaption(buffer, NULL); 
In C, you can do this using sprintf.
Check out this link:
http://msdn.microsoft.com/en-us/library/ybk95axf(v=vs.71).aspx
Don't use + for adding char pointers (that's what they are in C, not strings).
EDIT:
If this is C++, as per the edit, use std::string, which has the + operator overloaded. You'll still need to convert the number to a string though.
Also, it's called concatenation.
You can either use strings, or if you are already settling for the new current C++ standard, there is also std::to_string:
#include <string> #include <iostream> int main() { const std::string str = "Foobar " + std::to_string(42); std::cout << str << '\n'; }
std::string.