Question

Do the following:

- Write and test a function that takes an array of doubles and returns the average of the values in the array
- Write and test a function that takes an array of doubles and returns number of values in the array that are above the average of the values in the array
- Write and test a function that takes an array of Strings and returns number of values in the array that start with an uppercase letter. You can use these built in functions
---String Class: char charAt(int index) Returns the char value at the specified index.
---Character Class: static boolean isUpperCase(char ch) Determines if the specified character is an uppercase character

Answer 1

public class StringTest {
        
        public static double findAvg(double arr[]) {
                double sum = 0;
                for(double x: arr) {
                        sum += x;
                }
                return sum/arr.length;
        }

        public static int aboveAvg(double arr[]) {
                double avg = findAvg(arr);

                int     count = 0;
                for(double x: arr) {
                        if(x > avg) {
                                count++;
                        }
                }
                return count;
        }
        public static int uppercaseStrings(String arr[]) {
                int     count = 0;
                for(String x: arr) {
                        if(Character.isUpperCase(x.charAt(0))) {
                                count++;
                        }
                }
                return count;
        }

        public static void main(String[] args) {
                System.out.println(findAvg(new double[] {2.5, 2.5, 5})); // 3.3
                System.out.println(aboveAvg(new double[] {2.5, 2.5, 5})); // 1
                System.out.println(uppercaseStrings(new String[] {"Tom", "jane", "maria"})); // 1
        }

}



    Please upvote, as i have given the exact answer as asked in question. Still in case of any concerns in code, let me know in comments. Thanks!