function overloading

This is a discussion on function overloading within the C++ Programming forums, part of the General Programming Boards category; When I compile the included code with the Borland c++ 5.5 command line tools I get the error: C:\BC45\bob>bcc32 over1.cpp ...

  1. #1
    Registered User
    Join Date
    Aug 2001
    Posts
    380

    function overloading

    When I compile the included code with the Borland c++ 5.5 command line tools I get the error:
    C:\BC45\bob>bcc32 over1.cpp
    Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland
    OVER1.CPP:
    Error E2015 OVER1.CPP 13: Ambiguity between 'std::abs(int)' and 'abs(int)' in fu
    nction main()
    Warning W8004 OVER1.CPP 20: 'i' is assigned a value that is never used in functi
    on main()
    *** 1 errors in Compile ***
    Why?

    Also, when I compile it with Borland C++ 4.5 it rounds 64.53 upto 65 when instead it should output 64.53. Isn't setprecision() used for specifying how many decimal places you want? Like in C you could say printf("%.2f");.


    Code:
    #include <iostream>
    #include <iomanip.h>
    
    int abs(int i);
    float abs(float x);
    int main()
    {
       int ians;
       float fans;
       int i = -15;
       float x = -64.53;
    
       ians = abs(i);
       cout << "Integer absolute value of -15 is " << ians << endl;
    
       fans = abs(x);
       cout << "Float absolute value of -64.53 is " << setprecision(2) << fans << endl;
       cin.get();
       return 0;
    }
    
    int abs(int i)
    {
       if(i < 0)
          return(i * -1);
       else
          return (i);
    }
    
    float abs(float x)
    {
       if(x < 0.0)
          return(x * -1.00);
       else
          return (x);
    }

  2. #2
    UNBANNED OneStiffRod's Avatar
    Join Date
    Jan 2002
    Posts
    669
    put a "using namespace std;" in there under the headers


    Also, naming a function the same as an STD fxn is not a good idea - create a namespace around your functions and everything should be good.

    Code:
    namespace myMath{
    int abs(int i);
    float abs(float x);
    }
    
    .......
    
    int myMath::abs(int i)
    {
       if(i < 0)
          return(i * -1);
       else
          return (i);
    }
    
    float myMath::abs(float x)
    {
       if(x < 0.0)
          return(x * -1.00);
       else
          return (x);
    }
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  3. #3
    &TH of undefined behavior Fordy's Avatar
    Join Date
    Aug 2001
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    5,789
    Or...if you want to use your functions glabally, add the global namespace specifire when you call

    ians = ::abs(i);

  4. #4
    Registered User matheo917's Avatar
    Join Date
    Sep 2001
    Posts
    279
    Instead all this, just stick to the old standard and put:

    Code:
    #include<iostream.h>   // with .h ending
    also get rid of the line

    Code:
    precision(2);
    and to get rid of all the warnings use 'double' instead of 'float' to avoid any data loss, i.e. (0.0 is a 'double')


    good luck

    matheo917

  5. #5
    Registered User
    Join Date
    Nov 2002
    Posts
    1,109
    iostream.h is like you said, old. it will produce warnings on newer compilers, just mentioning if you decide to use it.

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