Question

Forms often allow a user to enter an integer. Write a program that takes in a string representing an integer as input, and outputs yes if every character is a digit 0-9

Answer 1

import java.util.Scanner;

public class StringNumber {
   public static void main(String[] args) {
       System.out.println("Enter Input: ");
       Scanner sc = new Scanner(System.in);
       String str=sc.nextLine();
       boolean flag=true;
       //iterating through each character
       for(int i=0;i            //if it is not digit than break
           if(!Character.isDigit(str.charAt(i))) {
               flag=false;
               break;
           }
       }
       if(flag)
           System.out.println("Yes");
       else
           System.out.println("No");
   }
}