Simple inheritance example??

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  1. #1
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    Unhappy Simple inheritance example??

    Hello,

    I want to learn inheritance for a game that I am trying to write, but can't find any good examples. Could someone write 2 simple classes where one is derived from the other?? I'd really appreciate it! Also, if you could thoroughly explain what you're doing it'd really help me. Thanks a lot!

  2. #2
    the hat of redundancy hat nvoigt's Avatar
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    Hannover, Germany
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    3,138
    Code:
    //base class 
    
    class Human
    {
        protected:
            int life;
        public:
            virtual void Die() = 0;
            virtual void Damage( int dmg ) = 0;
    };
    
    //derived class 1
    
    class Civilian : public Human
    {
        public:
    
        Civilian()
        {
            life = 10;
        }
        void Die()
        {
            printf( "...dead" );
        }
        void Damage( int dmg )
        {
            life = life - dmg;
            if( life < 0 ) Die();
        }
    };
    
    //derived class 2
    
    class Soldier : public Human
    {
        public:
    
        Soldier()
        {
              life = 15;
        }
        void Die()
        {
            printf( "...throwing last handgrenade... dead" );
        }
        void Damage( int dmg )
        {
            life = life - ( dmg - 1 ); // 1 point armor
            if( life < 0 ) Die();
        }
    };
    
    void Hurt( Human& person )
    {
        person.Damage( 5 );
    }
    
    int main()
    {
        Civilian a;
        Soldier b;
    
        Hurt( a );
        Hurt( a );
        Hurt( a );
        Hurt( a );
    
        Hurt( b );
        Hurt( b );
        Hurt( b );
        Hurt( b );
        Hurt( b );
        Hurt( b );
    
        return 0;
    }
    hth
    -nv

    She was so Blonde, she spent 20 minutes looking at the orange juice can because it said "Concentrate."

    When in doubt, read the FAQ.
    Then ask a smart question.

  3. #3
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    156
    Great example. But if you put Hurt as a virtual function in your base class you could either except it or change Hurt's power rather than adjusting it in Damage. Then it would be completely polymorphic.

  4. #4
    the hat of redundancy hat nvoigt's Avatar
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    I could just call Damage( 5 ) on a and b in main, but that would
    defeat the purpose of showing that you can now have a generic
    Human and don't care what type it is...
    hth
    -nv

    She was so Blonde, she spent 20 minutes looking at the orange juice can because it said "Concentrate."

    When in doubt, read the FAQ.
    Then ask a smart question.

  5. #5
    Registered User
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    Oct 2001
    Posts
    42
    That was cool


    Marky_Mark

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