Here is the optimized solution in Java. Copy or view it below.
Java
package Problems_On_Number_System;
import java.util.Scanner;
public class DecimalToOctal {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("enter the decimal value:");
int n = sc.nextInt();
String octal = "";
while (n > 0) {
int temp = n % 8;
octal = temp + octal;
n = n / 8;
}
System.out.println("the octal value is " + octal);
sc.close();
}
}