6.1(数学:五角数)
1 import java.util.*; 2 3 public class o { 4 static int i=0; 5 static int k=0; 6 public static int getPentagonalNumber(int n) { 7 k++; 8 return i*(3*i-1)/2; 9 } 10 11 12 public static void main(String[] args) { 13 Scanner input = new Scanner (System.in); 14 System.out.println("请输入五角数的数量:"); 15 int n = input.nextInt(); 16 for(;i<n;i++) { 17 System.out.print(getPentagonalNumber(n)+" "); 18 if(k%10==0) { 19 System.out.print(" "); 20 } 21 } 22 } 23 }
6.2*(求一个整数各位数字之和)
1 import java.util.*; 2 3 public class o { 4 5 public static int sumDigits(long n) { 6 long a = n / 100; 7 long b = n % 100 /10; 8 long c = n % 10; 9 return (int) (a+b+c); 10 11 } 12 13 public static void main(String[] args) { 14 System.out.print("请输入一位三位数:"); 15 Scanner input = new Scanner (System.in); 16 long n = input.nextLong(); 17 while(n>999||n<100) { 18 n = input.nextLong(); 19 } 20 System.out.println(sumDigits(n)); 21 } 22 }
注:能力不足,只能输入一个三位数,求其各位数字之和