Is it possible to convert float to LPCSTR {aka const char*}

[9hbfjE8b]

Is it possible to convert float to char and show 3.333... instead of 3 in a message box or in a text box?

#include <iostream>
#include <windows.h>

using namespace std;

int main()
{
    float num1 = 10;
    float num2 = 3;
    float result = num1 / num2;

    char fresult[0];
    itoa(result, fresult, 10);

    MessageBox(NULL, fresult, "Result", MB_OK);
    return 0;
}

[ahcfan]

Whenever I want to convert a number to string I use an std::stringstream.

std::wstringstream wss(L"");
wss << fresult;

MessageBox(NULL, wss.str().c_str(), NULL, 0);

[9hbfjE8b]

Thank you, although I am getting an error:

error: variable 'std::wstringstream wss' has initializer but incomplete type

[ahcfan]

Did you #include <sstream>?

[9hbfjE8b]

Oops... I did it now and it gives me another error:

error: cannot convert 'const wchar_t*' to 'LPCSTR {aka const char*}' for argument '2' to 'int MessageBoxA(HWND, LPCSTR, LPCSTR, UINT)'

My code:

#include <iostream>
#include <windows.h>
#include <sstream>

using namespace std;

int main()
{
float num1 = 10;
float num2 = 3;
float result = num1 / num2;

char fresult[0];
std::wstringstream wss(L"");
wss << fresult;

MessageBox(NULL, wss.str().c_str(), NULL, 0);
return 0;
}

[ahcfan]

Oh, use std::stringstream instead of std::wstringstream or use MessageBoxW() instead of MessageBox().

[9hbfjE8b]

I used std::stringstream and it gives me one more error:

error: no matching function for call to 'std::basic_stringstream<char>::basic_stringstream(const wchar_t [1])'

[ahcfan]

std::wstringstream wss(L"");

The L"" is a wide-char string. For a normal char string remove the L.

[9hbfjE8b]

Ok but it doesn't show 3.333..., it shows T"u or T"y etc. Is it possible for wss.str().c_str() to print 3.333...?

[ahcfan]

It should do... What is T"u and T"y?

[9hbfjE8b]

Okay, this is the code:

#include <iostream>
#include <windows.h>
#include <sstream>

using namespace std;

int main()
{
float num1 = 10;
float num2 = 3;
float result = num1 / num2;

char fresult[0];
std::stringstream wss("");
wss << fresult;

MessageBox(NULL, wss.str().c_str(), NULL, 0);
return 0;
}

now, I want the message box to show: num1 / num2, but instead it shows me the letter T,

this symbol " and one random character while it should be showing the result of num1

divided by num2 which is 3.333... (10 / 3 = 3.333...)

[ahcfan]

wss << fresult;

should be

wss << result;

fresult contains junk because you didn't initialize it with anything.

[9hbfjE8b]

Yes, thank you very much, that did it, thank you sir :)