Question

How do you code in Java a method (lets say its called PosOddAverage) that:

- Takes an array of doubles as input
- Prints the avearge of positive odd numbers in the array
- Prints 'ERROR' for empty input array

An Example:

Input: [1.2,1.5,0.0,-2.3,3.5,7.1,-1.3]
Output: 4.03333333

Thanks :)

Answer 1

public class OddNumber {

   public static void PosOddAverage(double[] arr) {
      
       int count=0;           // count of odd numbers in the array
       double sum=0;       // sum of odd numbers int the array
      
       if(arr.length!=0) {                               // if array is not empty then only we will calculate average
           for( int i=0;i<arr.length;i++) {   //traversing till array length to calculate sum of the odd numbers
              
               if((arr[i]*10)%2==1) {               // if number is odd and positive(-1!=1 satisfying positive condition) we will enter into loop(multiplying it by 10 eliminates decimal point then making %2 equals one then its an odd number
                   sum=sum+arr[i];                   // adding every odd number to sum value
                   count++;                                   // and incrementing the count of the odd numbers
               }
           }
           double Average=sum/count;       //average of the odd numbers in the array where average=sum of digits/count of digits
           System.out.printf("Average of Positive Odd: %f", Average);       //finally printing the average of the odd numbers in the array
       }  
       else {
           System.out.println("ERROR:Empty input Array");   // if array is empty prints relevant message
       }
   }
   public static void main(String[] args) {
      
       double arr[]= {1.2,1.5,0.0,-2.3,3.5,7.1,-1.3};
       PosOddAverage(arr);  
   }

}

Output:

Output: If empty array is present.