Printing float numbers

This is a discussion on Printing float numbers within the C++ Programming forums, part of the General Programming Boards category; How can I print a float number, using a fixed precision? In C would be: printf("%.20f",number); Thanks in advance!...

  1. #1
    Disturbed Boy gustavosserra's Avatar
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    Printing float numbers

    How can I print a float number, using a fixed precision?
    In C would be:
    printf("%.20f",number);
    Thanks in advance!
    Nothing more to tell about me...
    Happy day =)

  2. #2
    Registered User hk_mp5kpdw's Avatar
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    One way is to use a combination of the setiosflags function and the setprecision function, i.e:
    Code:
    float f = 9.87463f;
    cout << f << endl;
    cout << setiosflags(ios::fixed) << setprecision(3) << f << endl;
    Output is:
    9.87463
    9.875
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  3. #3
    Disturbed Boy gustavosserra's Avatar
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    Thanks for the reply, but I was talking about fill with 0īs the number, for example:
    Code:
    float f=0.6;
    float f2=0.12;
    printf("%.5f\n%.5f");
    Output:
    0.60000
    0.12000
    Nothing more to tell about me...
    Happy day =)

  4. #4
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    Code:
    #include <iostream>
    #include <iomanip>
    using namespace std;
    
    int main()
    {
       float f = .56;
       cout.setf(ios::showpoint | ios::fixed);
       cout << f << endl;
       return 0;
    }
    something like this?

  5. #5
    Registered User major_small's Avatar
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    the code that hk_mp5kpdw gave you should do what you want it to...
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