2018/12/04 PAT刷题 L1-008 求整数段和 java

使用Scanner的方法, 代码如下:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        int a, b;
        a = scanner.nextInt();
        b = scanner.nextInt();
        int[] list = new int[b - a + 1];
        int cnt = 0;
        int sum = 0;
        for (int i = a; i <= b; i++) {
            if (cnt < 5) {
                System.out.printf("%5d", i);
                cnt++;
                sum += i;
            } else {
                System.out.println();
                System.out.printf("%5d", i);
                sum += i;
                cnt = 1;
            }
        }
        System.out.println();
        System.out.print("Sum = " + sum);
    }
}

使用更加高效的BufferedReader, 代码如下:

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main2 {
    public static void main(String[] args) throws Exception {
        
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int a, b;
        String[] str = br.readLine().split(" ");
        a = Integer.parseInt(str[0]);
        b = Integer.parseInt(str[1]);
        // int[] list = new int[b - a + 1];
        int cnt = 0;
        int sum = 0;
        for (int i = a; i <= b; i++) {
            if (cnt < 5) {
                System.out.printf("%5d", i);
                cnt++;
                sum += i;
            } else {
                System.out.println();
                System.out.printf("%5d", i);
                sum += i;
                cnt = 1;
            }
        }
        System.out.println();
        System.out.print("Sum = " + sum);
    }
}