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Thread: Calculating average of an array

  1. #1
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    Default Calculating average of an array

    Have written a program for my uni assignment that stores information about fitness club members(such as name, age weight, BMI index etc.) One of the operations that program must perform is to calculate an average BMI index. The method I have written returns value of 0 and can't figure out where the problem lays.

    public double averageBmi()//to calculate average BMI index
    	{
    		double numbers[]=new double[this.list.length];
    		double result=0;
    		for(int i=0;i<numbers.length;i++){
    			double b=this.list[i].Bmiindex;
    			result=result+numbers[i];
    		}
     
    		System.out.println("Average BMI is "+result/numbers.length);
    		return result;
    	}
    Any ideas why?


  2. #2
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    Default Re: Calculating average of an array

    numbers is empty !!! wath is double b ?

  3. #3
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    Default Re: Calculating average of an array

    double b is accessing list of all Bmiindexes stored in another class

  4. #4
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    Default Re: Calculating average of an array

    but number[] is still empty 0+0=0
    meybe rezult=rezult+b

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  6. #5
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    Default Re: Calculating average of an array

    It works now! Thanks a lot!

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    Default Re: Calculating average of an array

    Facing the same issue with the method calculating average age for each group
    public double averageAge() // 
    	{
    		double numbers[]=new double[this.list.length];
    		double result=0;
    		char[] cat={'O','U','N'};
    		for (int i=0;i<this.list.length;i++){
    			int b=this.list[i].age;
    			for(int j=0;j<3;j++){//loop runs three times, as there are three categories
    				if(b == cat[j])
    			result=result+b;
    		}
    }       for (int j=0;j<3;j++) 
    		System.out.println("Average age in group "+cat[j]+ " is "+result/numbers.length);
    		return result;
    }

  8. #7
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    Default Re: Calculating average of an array

    I have removed your other thread as the content is duplicated.
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  9. #8
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    Default Re: Calculating average of an array

    1. Most probably, your list is throwing garbage instead of any value.
    2. You should use explicit type casting in calculation.

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