How to manipulate arrays Find the average Beginner Java

Question

I have a homework assignment and I was wondering if anyone could help me as I am new to Java and programming and am stuck on a question  The question is    The first method finds the average of the elements of an integer array   public double average int   data    That is  given an integer array  data  calculate the average of its elements are return the average value  For example  the average of  1  3  2  5  8  is 3 8    Here is what I have done so far    public double average int   data          int sum   0       while int i 0  i  lt  data length  i          sum   sum   data i        double average   sum   data length         System out println  Average value of array element is       average       When compiling it I get an error message at the int i 0 part saying   class expected   Any help would be appreciated

User · Answer

Couple of problems   The while should be a for You are not returning a value but you have declared a return type of double  double average   sum   data length     sum and data length are both ints so the division will return an int - check your types  double semi-colon  probably won t break it  just looks odd

User · Answer

If we want to add numbers of an Array and find the average of them follow this easy way         public class Array        public static void main String   args             int  array    1 3 5 7 9 6 3           int i 0          int sum 0          double average 0          for  i 0 i lt array length i                 System out println array i                sum sum array i                     System out println  sum is   sum           System out println  average is     double sum vargu length

User · Answer

Well  to calculate the average of an array  you can consider using for loop instead of while loop   So as per your question let me assume an array as arrNumbers   here i m considering the same array elements as in your question    int arrNumbers     new int   1  3  2  5  8   int sum   0   for int a   0  a  lt  arrNumbers length  a         sum   sum   arrNumbers a      double average   sum   arrNumbers length   System out println  Average is      average     You can use scanner class as well  It s left to you

User · Answer

Using an enhanced for would be even nicer   int sum   0  for  int d   data  sum    d    Another thing that will probably give you a big surprise is the wrong result that you will obtain from  double average   sum   data length    Reason  on the right-hand side you have integer division and Java will not automatically promote it to floating-point division  It will calculate the integer quotient of sum data length and only then promote that integer to a double  A solution would be  double average   1 0d   sum   data length    This will force the dividend into a double  which will automatically propagate to the divisor

User · Answer

-while int i 0  i  lt  data length  i      for int i 0  i  lt  data length  i

User · Answer

The Java 8 streaming api offers an elegant alternative   public static void main String   args        double avg   Arrays stream new int   1 3 2 5 8   average   getAsDouble         System out println  avg      avg

User · Answer

Try this way  public void average int   data          int sum   0      double average       for int i 0  i  lt  data length  i             sum   sum   data i             average    double sum data length      System out println  Average value of array element is     average           if you need to return average value you need to use double key word Instead of the void key word and need to return value return average   public double average int   data          int sum   0      double average       for int i 0  i  lt  data length  i             sum   sum   data i             average    double sum data length      return average

User · Answer

Best way to find the average of some numbers is  trying  Classes         public static void main String   args        average 1 2 5 4       public static void average int   numbers       int total   0      for int x  numbers           total  x            System out println  Average is     double total numbers length

[java] How to manipulate arrays. Find the average. Beginner Java

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