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Inheritance

Posted on 2008-09-30
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Last Modified: 2012-05-05
I have written code in one file(FoodItem.cs).Solution name is ConsoleApplication2:
using System;

namespace ConsoleApplication2
{
      /// <summary>
      /// Summary description for FoodItem.
      /// </summary>
      public class FoodItem
      {
            
            extern int  Calories_Per_Gram=9;
            private  int fatgrams;
            protected int servings;            
      
            public FoodItem(int Fatgrams1,int servings1)
            {
                  fatgrams=Fatgrams1;
                  servings=servings1;
            }
            
            private int Calories()
            {
                  return fatgrams *Calories_Per_Gram ;
            }

            public int CaloriesPerSavings()
            {      
                  return(Calories ()/servings );
            }
      }

}

I build the above file.
Now in Another file(Pizza.cs) in ConsoleApplication2,I code:

using System;

namespace ConsoleApplication2
{
      /// <summary>
      /// Summary description for Pizza.
      /// </summary>
 public class Pizza extends  FoodItem
      {
            public Pizza (int FatGrams)
                  {
                        super(Fatgrams,8);
                  }
            }
      
}


It is showing errors:
1) at extern
2) public pizza(at the constructor)
3) at super
0
Comment
Question by:sarang8180
  • 2
4 Comments
 
LVL 6

Assisted Solution

by:xRalf
xRalf earned 600 total points
ID: 22603820
Hello sarang8180,

extends and super are not C# keywords. Maybe you were using java. Try to look at the C# syntax.

Regards,

xRalf
0
 
LVL 10

Accepted Solution

by:
oxyoo earned 1400 total points
ID: 22603833
Hi,

Here's a working example (namespace part not included)...
    /// <summary>
    /// Summary description for FoodItem.
    /// </summary>
    public class FoodItem
    {
        private extern int Calories_Per_Gram = 9;
        private readonly int fatgrams;
        protected int servings;
 
        public FoodItem()
        {
        }
 
        public FoodItem(int Fatgrams1, int servings1)
        {
            fatgrams = Fatgrams1;
            servings = servings1;
        }
 
        private int Calories()
        {
            return fatgrams*Calories_Per_Gram;
        }
 
        public int CaloriesPerSavings()
        {
            return (Calories()/servings);
        }
    }
 
 
 
 
 
 
    /// <summary>
    /// Summary description for Pizza.
    /// </summary>
    public class Pizza : FoodItem
    {
        public Pizza(int fatGrams) : base(fatGrams, 8)
        {
        }
    }

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0
 

Author Comment

by:sarang8180
ID: 22603998
now it is showing error in FoddItem.cs

the modifier 'extern' is not valid for this item
0
 
LVL 10

Expert Comment

by:oxyoo
ID: 22604008
Hi,

Change
        private extern int Calories_Per_Gram = 9;

To
        private readonly int Calories_Per_Gram = 9;

You are not allowed to use extern there.
0

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