Display a Variable in MessageBox c++

Create a temporary buffer to store your string in and use sprintf, change the formatting depending on your variable type. For your first example the following should work:

 char buff[100]; string name = "stackoverflow"; sprintf_s(buff, "name is:%s", name.c_str()); cout << buff;

Then call message box with buff as the string argument

MessageBox(hWnd, buff, "Msg title", MB_OK | MB_ICONQUESTION);

for an int change to:

int d = 3;sprintf_s(buff, "name is:%d",d);

This can be done with a macro

#define MSGBOX(x) \{ \   std::ostringstream oss; \   oss << x; \   MessageBox(oss.str().c_str(), "Msg Title", MB_OK | MB_ICONQUESTION); \}

To use

string x = "fred";int d = 3;MSGBOX("In its simplest form");MSGBOX("String x is " << x);MSGBOX("Number value is " << d);

Alternatively, you can use varargs (the old fashioned way: not the C++11 way which I haven't got the hang of yet)

void MsgBox(const char* str, ...){    va_list vl;    va_start(vl, str);    char buff[1024];  // May need to be bigger    vsprintf(buff, str, vl);    MessageBox(buff, "MsgTitle", MB_OK | MB_ICONQUESTION);}string x = "fred";int d = 3;MsgBox("In its simplest form");MsgBox("String x is %s", x.c_str());MsgBox("Number value is %d", d);

Answer to your question:

string name = 'stackoverflow';

MessageBox("name is: "+name , "Msg title", MB_OK | MB_ICONQUESTION);

do in same way for others.