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float in the string

Discussion in 'MFC' started by inspiration, May 30, 2010.

  1. inspiration

    inspiration New Member

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    Hi,
    how can I in a floatvariable a String "installation when" the float to 2 digits after the decimal point limit?
     
  2. pankaj.sea

    pankaj.sea New Member

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    One can for example, the first floating point number two decimal places to round out the string and then write.
    Here's an example code for rounding:

    Code:
    #include <iostream> 
    using namespace std; 
    
    int main() 
    { 
        float zahl; 
        cin >> zahl; 
        zahl = int( 100*zahl + 0.5 ) / 100.0; //runden auf 2 Nachkommastellen 
        cout << zahl; 
        return 0; 
    }
     
  3. inspiration

    inspiration New Member

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    Thank you

    forgot to say that I Basisstation a CString.
    The rounds went well with that, but how do I get it out that if I then only with two digits after the comma in the string will have the number?

    So
    string.Format (" % f ", num);
     
  4. creative

    creative New Member

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    1st looking times in the FAQ, then you knew more ...
    second the resolution of the should be at best int ...
    Code:
    int = float * 100; 
    float = int, 
    float / = 100; 
    CString:: format ("% f", float); 
     
  5. techme

    techme New Member

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    Code:
    CString strFloat; / / Here is the float-variable inside 
    
    strFloat.SetAt ((strFloat.Find (' .') +2),' \ 0 ');
    The idea:
    I am looking for the point ('.'), So put the comma, and put two characters followed by a '\ 0', which ends the string
     
  6. inspiration

    inspiration New Member

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    Thanks creative, but that did not mean I have as far as ego already at Erhard understood.
    After your method is yes, then the string

    as: 12.560000
    , it is only 12:56 in the string are.

    and the method of techme I can not even use, because in String 3 floats each will stand with 2nachkommastellen.
     
  7. creative

    creative New Member

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    but then take only three strings, each with a float inside the pack-var and then together an easy-to-string
     
  8. techinspiration

    techinspiration New Member

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    Hello, try the following times:
    Code:
    float fValue = 0.047645645; 
    CString strAusgabe; 
    strAusgabe.Format (" % .2 f ", fValue);
    the .2 you lay by the precision fixed. In the fall she is 2 decimal places.
    The float is automatically rounded, ie strAusgabe contains the string "0.05"
     
  9. creative

    creative New Member

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    Uff! Do not something like! You have very bad problems later if you believe in what the string anhengen still want!
    Code:
    CString strWithNULL = " Hello "; 
    strWithNULL.Replace (" ! "," \ 0 "); 
    strWithNULL + = " hello "; 
    MessageBox (strWithNULL);
    The MessageBox is now Hello and nciht, as perhaps expected Hello, hello ...
     
  10. inspiration

    inspiration New Member

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    thanks everybody!

    :)
     

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