When I run my code I get an error that says

"DigitExtractor1.java:41: error: bad operand types for binary operator '%' oneDigit = (byte)(userInput % 10); ^ first type: String second type: int"

Im not sure where it went wrong. I thought when I casted the string to an int, it became an int? intCastFrmString = Integer.parseInt(userInput);

Here is the code:

import java.util.Scanner;

public class DigitExtractor1{
   
   public static void main(String[]args){
      
      //variables
      final int PERIOD_UNICODE = (int) ('.');
      String userInput;
      int intCastFrmString;
      byte oneDigit;
      boolean validInput;
      
      //scanner object
      Scanner x = new Scanner(System.in);
      
      System.out.print("Enter an integer: ");
      userInput = x.nextLine();
      
      //loop to collect input from the user
      if (userInput.indexOf(PERIOD_UNICODE) != -1){
         validInput = false;
         System.out.println("Input is a floating pt number; try again: ");
         
      }else{
         validInput = true;
         System.out.println(userInput   " is a vlaid integer");
         //string to an int
         intCastFrmString = Integer.parseInt(userInput);
      }
      
      //loop to extract and display the digits in int
      System.out.println("Extracted digits of: "   userInput);
      do{
         //determine rightmost digit
         oneDigit = (byte)(userInput % 10);
         
         //if oneDig is neg, display purposes, take abs val
         if(oneDigit < 0)
            oneDigit *= -1;
            
         //display digit
         System.out.println(oneDigit);
         
         //reduce the int by factor of ten
         userInput /= 10;
      }while(userInput != 0);

   }
}

CodePudding user response：

You are using userInput, which has the type string, in oneDigit = (byte)(userInput % 10);, userInput /= 10;, and userInput != 0 instead of the int intCastFrmString.

CodePudding user response：

I suggest you to use br.readLine() and then convert it to int using type casting