Convert to float from textbox

Hallo i try to convert the value from the textbox to float i use this code :
float a;
if(rb1->Checked){a=Convert::ToFloat(tb1->Text);tb26->Text=Convert::ToString(a);}

what have i done wrong ?

Quote:

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Originally Posted by Pavaka

Hallo i try to convert the value from the textbox to float i use this code :

Code:

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float a;
if(rb1->Checked){a=Convert::ToFloat(tb1->Text);tb26->Text=Convert::ToString(a);}

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what have i done wrong ?

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Well, putting all that code on one line is not a good idea for starters :(
But to answer your question properly, you need to give us more details as to what problem you are having.

Actually, there is no such function as Convert::ToFloat(). The "official" .NET name of that type is Single, and float is just an alias name for that type in C++/CLI (and, AFAIK, in C#). Consequentially, the function you need to call is Convert::ToSingle().

Also, as already has been pointed out, putting all that code on a single line without a single whitespace is no good idea with regard to coding style, though of course it doesn't keep the code from compiling successfully.

Finally, this is a C++/CLI question, and as such it's in the wrong place here. There's a separate forum section for C++/CLI: http://www.codeguru.com/forum/forumdisplay.php?f=17

You could simply use atof()

Quote:

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Originally Posted by mlgoff

You could simply use atof()

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Not quite simple.
You can use atof or any other CRT function in managed C++/CLI, but you have to "scratch your had with the foot".
Something like this:

Code:

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#include <stdlib.h>
  // ...
  String^ str = textBox1->Text;
  char* szValue =
      (char*)(void*)System::Runtime::InteropServices::Marshal::StringToHGlobalAnsi(str);
  float fValue = (float)atof(szValue);

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Much easier and correct is to use the "managed way", like Eri already suggested:

Code:

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  float fValue = Convert::ToSingle(textBox1->Text);

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So...

Quote:

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When in Rome, do as the Romans do!

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In other words, when in managed C++/CLI, do as .NET programmers do. :)

@Pavaka:
I'm just curious...
Is your IntelliSense tool out of order and is showing Convert::ToFloat method?
Also, have you lost the Internet connection with MSDN Library? ;)


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