Question

I have, a float number. I would like to print it inside a messagebox. How to do it?

MessageBox(hWnd, "Result = <float>", L"Error", MB_OK);

update:

I do this and it prints out chinese characters inside the messagebox.

 float fp = 2.3333f;
 sprintf(buffer,"%f",fp);
 MessageBox(hWnd, LPCWSTR(buffer), L"Error", MB_OK);

Answer 1

As you are using the wchar_t versions of the Win32-functions you should use swprintf instead of sprintf:

float fp = 2.3333f;
const size_t len = 256;
wchar_t buffer[len] = {};
swprintf(buffer, L"%f", fp);
MessageBox(hWnd, buffer, L"Error", MB_OK);

To avoid potential buffer overruns you could also use _snwprintf:

float fp = 2.3333f;
const size_t len = 256;
wchar_t buffer[len] = {};
_snwprintf(buffer, len - 1, L"%f", fp);
MessageBox(hWnd, buffer, L"Error", MB_OK);

Or better yet, use std::wostringstream declared in <sstream>:

float fp = 2.3333f;
std::wostringstream ss;
ss << fp;
MessageBox(hWnd, ss.str().c_str(), L"Error", MB_OK);