Thread: very amateur question:

  1. #1
    Registered User
    Join Date
    Jun 2003

    very amateur question:

    How do i get a number to display only two decimal points? I'm using a float variable, and i know that it's default is 6 decimal spots. Is there a way to change this? or a new variable type?

  2. #2
    C++ Developer XSquared's Avatar
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    Jun 2002
    Ontario, Canada
    float f = 0.333;
    cout.setprecision( 2 );
    cout<<f<<endl; //Should output 0.33
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  3. #3
    Registered User
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    Jun 2003
    i get the following error:

    error C2039: 'setprecision' : is not a member of 'ostream_withassign'
    i've inly included the following:
    #include <iostream.h>
    #include <string.h>
    #include <stdlib.h>

  4. #4
    Registered User
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    Jun 2003
    aha, i got it, its "precision" w/o the "set". thanks.

  5. #5
    It's full of stars adrianxw's Avatar
    Join Date
    Aug 2001
    Try this...
    #include <iostream>
    #include <iomanip>
    using namespace std;
    cout << setprecision(2);
    ... this should work. setprecision() is the ANSI standard manipulator. I suspect it failed in your setup because you are using the old style headers, (those with .h on them), and not the standard compliant ones declared in namespace std.

    If you try this and it fails, tell me what compiler you are using.
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  6. #6
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
    >>#include <iomanip>
    This was the missing item causing the problem. It's where setprecision lives.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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