Skip to Content
CoursesCSC122โปรแกรมบวกเลข 5 ตัวต่อไป

โปรแกรมบวกเลข 5 ตัวต่อไป

โจทย์

Write a program to find sum of numbers by adding or subtracting the next five integer numbers from the given number (not included in the sum) according to the following conditions:

  1. If the last digit is 3, subtract that number.
  2. If the fist digit is 2 or 5, subtract that number.
  3. If the middle digit is 4 (in case of there are odd digits), subtract that number.
  4. Otherwise, add the number.
InputOutput
20-115
79244
345-1040

โค้ด

import java.util.Scanner;
 
public class Program {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
 
        int sum = 0;
 
        for (int i = 0; i < 5; i++) {
            int currentNum = num + i + 1;
            int multiplier = determineMultiplier(currentNum);
            sum += multiplier * currentNum;
        }
 
        System.out.print(sum);
    }
 
    private static int determineMultiplier(int number) {
        String numStr = String.valueOf(number);
        int length = numStr.length();
 
        boolean endsWithThree = numStr.endsWith("3");
        boolean startsWithTwoOrFive = numStr.startsWith("2") || numStr.startsWith("5");
        boolean middleIsFour = length > 2 && length % 2 == 1 && numStr.charAt(length / 2) == '4';
 
        return (endsWithThree || startsWithTwoOrFive || middleIsFour) ? -1 : 1;
    }
}

คำอธิบาย

ปรับปรุงล่าสุด