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  1. class Test {
  2.  
  3.   public static void main(String[] args) {
  4.  
  5.     int num = 12345;
  6.  
  7.     Keta k = new Keta(num);
  8.     for (int i = 1; i <= 5; i++) {
  9.       System.out.println(String.format("%d桁目の値=%d", i, k.ketaNum(i)));
  10.     }
  11.  
  12.     System.out.println(String.format("各位の数の合計=%d", k.sumKeta()));
  13.   }
  14.  
  15.   static class Keta {
  16.  
  17.     private int num;
  18.  
  19.     public Keta(int num) {
  20.       this.num = num;
  21.     }
  22.  
  23.     int ketaNum(int n) {
  24.       if (n <= 0) {
  25.         return 0;
  26.       }
  27.       int syo = num / ((int) Math.pow(10, n - 1));
  28.       if (syo == 0) {
  29.         return 0;
  30.       }
  31.       return syo % 10;
  32.     }
  33.  
  34.     int keta() {
  35.       int i = 1;
  36.       while (true) {
  37.         if (ketaNum(i) == 0) {
  38.           break;
  39.         }
  40.         i++;
  41.       }
  42.       return i - 1;
  43.     }
  44.  
  45.     int sumKeta() {
  46.       return sumKeta(keta());
  47.     }
  48.  
  49.     int sumKeta(int n) {
  50.       int keta = ketaNum(n);
  51.       if (keta == 0) {
  52.         return 0;
  53.       }
  54.       return keta + sumKeta(n - 1);
  55.     }
  56.   }
  57. }
  58.  
Success #stdin #stdout 0.08s 380160KB
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stdin
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Standard input is empty
stdout
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1桁目の値=5
2桁目の値=4
3桁目の値=3
4桁目の値=2
5桁目の値=1
各位の数の合計=15
https://ideone.com/n6woTN
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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