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  1. import java.util.Scanner;
  2.  
  3. public class Main {
  4.     public static boolean IsDigit(char c) {
  5.         return Character.isDigit(c);
  6.     }
  7.  
  8.     public static void main(String[] args) {
  9.         Scanner scanner = new Scanner(System.in);
  10.         char c = scanner.next().charAt(0);
  11.         System.out.println(IsDigit(c) ? "yes" : "no");
  12.     }
  13. }
  14.  
Success #stdin #stdout 0.14s 56788KB
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https://ideone.com/6UaBcg
language:
Java (HotSpot 12)
created:
23 hours ago
visibility:
public

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