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Iterative Constructs in Java

Chapter 9

Iterative Constructs in Java

Class 10 - Logix Kips ICSE Computer Applications with BlueJ
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Java Program: Remove All Zeros from a Number

17. Write a program in Java to read a number, remove all zeros from it, and display the new number. For example,

Sample Input: 45407703
Sample Output: 454773

Java 
import java.util.Scanner;


 


public class RemoveZeros {


    public static void main(String[] args) {


 


        Scanner sc = new Scanner(System.in);


 


        System.out.print("Enter a number: ");


        long num = sc.nextLong();


 


        long temp = num;


        long result = 0;


        long place = 1;


 


        while (temp > 0) {


            long digit = temp % 10;


 


            if (digit != 0) {


                result = result + digit * place;


                place = place * 10;


            }


 


            temp = temp / 10;


        }


 


        System.out.println("Number after removing zeros: " + result);


    }


}

Output

Sample Input
45407703
Sample Output
Number after removing zeros: 454773

📝 Explanation

  • Extract digits one by one using % 10
  • Ignore the digit if it is 0
  • Rebuild the number using positional value (place)
  • / 10 removes the last digit in each loop iteration

✨ Key Logic

If digit ≠ 0 → keep it

If digit = 0 → discard it

 

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