some help needed here

This is a discussion on some help needed here within the C++ Programming forums, part of the General Programming Boards category; Code: // To convert meter to feet and inch #include <iostream> using namespace std; const float M = 3.25; class ...

  1. #1
    Registered User n3cr0_l0rd's Avatar
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    some help needed here

    Code:
    // To convert meter to feet and inch
    #include <iostream>
    using namespace std;
    const float M = 3.25;
    class distance
    {
        private:
            int feet;
            float inch, meter;
    	public:
            distance() {}
            ~distance() {}
            distance(float a)
            {
                meter = a;
                float k = meter*M;
                feet = int(k);
                inch = (k-feet) * 12.0;
            }
            void show()
            {
                cout << feet << " feets " << inch << " inches" << endl;
            }
    };
    
    int main()
    {
        distance::distance d1(1.5);
        d1.show();
        system("pause");
        return 0;
    }
    if i dont use distance::distance d1(1.5) and rather use just distance d1(1.5), i get a series of error messages:
    I:\C++\Lab 7\1a.cpp||In function `int main()':|
    I:\C++\Lab 7\1a.cpp|32|error: use of `distance' is ambiguous|
    I:\C++\Lab 7\1a.cpp|10|error: first declared as `class distance' here|
    i:\CodeBlocks\MinGW\bin\..\lib\gcc\mingw32\3.4.5\. .\..\..\..\include\c++\3.4.5\bits\stl_iterator_bas e_funcs.h|115|error: also declared as `typename std::iterator_traits<_Iterator>::difference_type std::distance(_InputIterator, _InputIterator)' here|
    I:\C++\Lab 7\1a.cpp|32|error: `distance' was not declared in this scope|
    I:\C++\Lab 7\1a.cpp|32|error: expected `;' before "d1"|
    I:\C++\Lab 7\1a.cpp|33|error: `d1' was not declared in this scope|
    ||=== Build finished: 6 errors, 0 warnings ===|
    I had crush on her, before that crush could CRUSH me, i CRUSHED that crush !!! Fun time over, Lets find a way to not to blow off the whole leg !

    __________________________________________________ __________________________________________________ _______________

    In C++ it's harder to shoot yourself in the foot, but when you do, you blow off your whole leg.
    - Bjarne Stroustrup

  2. #2
    Making mistakes
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    There's also a std::distance. They conflict.

    That's why you should never use namespace std!

  3. #3
    and the hat of wrongness Salem's Avatar
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    Pick another name - it seems there is a distance somewhere in the STL.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  4. #4
    Registered User n3cr0_l0rd's Avatar
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    @brafil, u mean i shouldn't do using namespace std; ???

    and thx to all
    I had crush on her, before that crush could CRUSH me, i CRUSHED that crush !!! Fun time over, Lets find a way to not to blow off the whole leg !

    __________________________________________________ __________________________________________________ _______________

    In C++ it's harder to shoot yourself in the foot, but when you do, you blow off your whole leg.
    - Bjarne Stroustrup

  5. #5
    and the hat of wrongness Salem's Avatar
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    Or make your own namespace perhaps.

    using namespace std;
    is a quick hack for the lazy typist.
    Sooner or later, sloppy use of namespace will bite you.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #6
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    If you just want to save yourself some typing when using cout, you can just do something like this which is safer:
    Code:
    using std::cout;
    using std::endl;
    using std::cin;

  7. #7
    Registered User n3cr0_l0rd's Avatar
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    umm... as i read in accelerated cpp, i should be doing
    using std::cout;
    using std::cin;
    .........
    Do you mean that ?
    I had crush on her, before that crush could CRUSH me, i CRUSHED that crush !!! Fun time over, Lets find a way to not to blow off the whole leg !

    __________________________________________________ __________________________________________________ _______________

    In C++ it's harder to shoot yourself in the foot, but when you do, you blow off your whole leg.
    - Bjarne Stroustrup

  8. #8
    Registered User
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    Yeah

  9. #9
    Registered User n3cr0_l0rd's Avatar
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    okay i get it then! thx guys
    I had crush on her, before that crush could CRUSH me, i CRUSHED that crush !!! Fun time over, Lets find a way to not to blow off the whole leg !

    __________________________________________________ __________________________________________________ _______________

    In C++ it's harder to shoot yourself in the foot, but when you do, you blow off your whole leg.
    - Bjarne Stroustrup

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