3.10编程打卡

import java.util.*;

public class o {

    static int i=0;

    static int k=0;

    public static int getPentagonalNumber(int n) {

        k++;

        return i*(3*i-1)/2;

    }

    public static void main(String[] args) {

        Scanner input = new Scanner (System.in);

        System.out.println("请输入五角数的数量：");

        int n = input.nextInt();

        for(;i<n;i++) {

            System.out.print(getPentagonalNumber(n)+" ");

         if(k%10==0) {

             System.out.print("\n");

         }

        }    

    }

}

import java.util.*;

public class o {

    public static int sumDigits(long n) {

        long a = n / 100;

long b = n % 100 /10;

long c = n % 10;

return (int) (a+b+c);

    }

    public static void main(String[] args) {

        System.out.print("请输入一位三位数：");

        Scanner input = new Scanner (System.in);

        long n = input.nextLong();

        while(n>999||n<100) {

            n = input.nextLong();

        }

        System.out.println(sumDigits(n));

    }

}