A river basin monitoring system assigns each basin a unique code in the format RB followed by a numeric identifier (for example, RB4319) of 4 digits only.

Write a program to accept a basin code and rainfall readings for N days, where 5 ≤ N ≤ 20. If the basin code is not in the correct format or if the value of N is outside the specified range, display an appropriate error message.

Your program should perform the following tasks:

• Extract the basin number from the basin code.
• Calculate the sum of all digits in the basin number.
• Store the rainfall readings and display:
  i. Highest rainfall
  ii. Lowest rainfall
  iii. Average rainfall
• Count the number of days on which the rainfall exceeds 150 mm.
• Display the rainfall status:
  If the average rainfall is greater than 150 mm, display: FLOOD WARNING GENERATED
  Otherwise, display NORMAL CONDITIONS

Test your program with the following data and some random data:

Example 1
INPUT:
Basin Code: RB4319
N: 6
180, 145, 170, 155, 190, 130
OUTPUT:
Basin Number: 4319
Digit Sum: 17
Highest Rainfall: 190
Lowest Rainfall: 130
Average Rainfall: 161.67
Days exceeding 150 mm: 4
FLOOD WARNING GENERATED

Example 2
INPUT:
Basin Code: RB5824
N: 5
120, 135, 140, 160, 145
OUTPUT:
Basin Number: 5824
Digit Sum: 19
Highest Rainfall: 160
Lowest Rainfall: 120
Average Rainfall: 140.00
Days exceeding 150 mm: 1
NORMAL CONDITIONS

Example 3
INPUT:
Basin Code: RB7608
N: 7
210, 185, 160, 175, 220, 195, 180
OUTPUT:
Basin Number: 7608
Digit Sum: 21
Highest Rainfall: 220
Lowest Rainfall: 160
Average Rainfall: 189.29
Days exceeding 150 mm: 7
FLOOD WARNING GENERATED

Example 4
INPUT:
Basin Code: R4319
OUTPUT:
Invalid Basin Code

Example 5
INPUT:
Basin Code: RB4319
N = 3
OUTPUT:
Invalid Number of Days

import java.util.Scanner;
class RiverBasin{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.print("Basin Code: ");
        String code = in.nextLine().toUpperCase();
        if(code.length() != 6 || !code.startsWith("RB")){
            System.out.println("Invalid Basin Code");
            return;
        }
        for(int i = 2; i < code.length(); i++){
            char ch = code.charAt(i);
            if(!Character.isDigit(ch)){
                System.out.println("Invalid Basin Code");
                return;
            }
        }
        System.out.print("N: ");
        int n = Integer.parseInt(in.nextLine());
        if(n < 5 || n > 20){
            System.out.println("Invalid Number of Days");
            return;
        }
        int a[] = new int[n];
        System.out.println("Enter rainfall readings:");
        int lowest = 0;
        int highest = 0;
        int total = 0;
        int count = 0;
        for(int i = 0; i < a.length; i++){
            a[i] = Integer.parseInt(in.nextLine());
            total += a[i];
            if(a[i] > 150)
                count++;
            if(i == 0)
                lowest = highest = a[i];
            else{
                if(lowest > a[i])
                    lowest = a[i];
                if(highest < a[i])
                    highest = a[i];
            }
        }
        int sum = 0;
        int num = Integer.parseInt(code.substring(2));
        System.out.println("Basin Number: " + num);
        while(num != 0){
            sum += num % 10;
            num /= 10;
        }
        System.out.println("Digit Sum: " + sum);
        System.out.println("Highest Rainfall: " + highest);
        System.out.println("Lowest Rainfall: " + lowest);
        double avg = (double)total / n;
        avg = Math.round(avg * 100) / 100.0;
        System.out.println("Average Rainfall: " + avg);
        System.out.println("Days exceeding 150 mm: " + count);
        if(avg > 150)
            System.out.println("FLOOD WARNING GENERATED");
        else
            System.out.println("NORMAL CONDITIONS");
    }
}