Answer 1

try:
public class Digit {

public static void main(String[] args) {

int n=153; // int number to separate in single digit
double sum=0;

do{
int i;
i=n%10;
n=n/10;

sum=sum+ Math.pow(i,3);

} while (n>10);
System.out.println(n+" "+sum);
}
}
the loop extracts the last digit of the number and puts it in the variable, then divide the number by 10 and added to the variable sum the cubes of i