int n = 3;
double numDigits = Math.log10(intValue);
if (numDigits > n) {
}

final int n = 3;
final int modifier = 10 ^ n; // = 1000;
int num1 = 525;
int num2 = 639;
int temp = num1 + num2; // = 1164;
int intResult = temp / modifier; // = 1
int fracResult = temp % modifier; // = 164;

class Money
{
    private final int places;
    private final int value; // or long
 
    public Money(int value, places)
    {
        this.places = places;
        this.value = value;
    }
 
    public Money(String text)
    {
       pos = value.indexOf('.');
 
       if (pos < 0) {
           places = 0;
           value = Integer.parseInt(value);
       } else {
           places = (value.length() - pos) - 1;
           value = Integer.parseInt(value.substring(0, pos) + value.subString(pos + 1));
    }
 
    Money add(Money other)
    {
        if (this.places == other.places) {
            return new Money(this.value + other.value, this.places);
        } else {
            // throw error or add places to one value
        }
    }
}