default values for struct members (noob q)

This is a discussion on default values for struct members (noob q) within the C++ Programming forums, part of the General Programming Boards category; how do you intialize struct members?...

  1. #1
    Registered User Mr_Jack's Avatar
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    default values for struct members (noob q)

    how do you intialize struct members?

  2. #2
    Registered User hk_mp5kpdw's Avatar
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    A struct can have constructors and functions associated with it just like a class can. Just make a constructor for the struct that assigns default values to the struct's data members. Is this what you mean or are you talking about something else?

    Code:
    #include <iostream>
    
    struct mystruct
    {
        int iVal;
        float fVal;
        mystruct() : iVal(5), fVal(9.9f) {}
    };
    
    int main()
    {
        mystruct item;
    
        std::cout << item.iVal << ' ' << item.fVal << std::endl;
    
        return 0;
    }
    Should output: 5 9.9
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
    -Christopher Hitchens

  3. #3
    Registered User Mr_Jack's Avatar
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    that is excactly what I wanted to know. Thank you.

  4. #4
    Code Goddess Prelude's Avatar
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    9,796
    >how do you intialize struct members?
    The alternative is an initialization list upon variable creation:
    Code:
    #include <iostream>
    
    struct mystruct {
      int   iVal;
      float fVal;
    };
    
    int main()
    {
      mystruct item = { 5, 9.9 };
      
      std::cout<< item.iVal <<' '<< item.fVal <<std::endl;
    }
    My best code is written with the delete key.

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