Convert double to int array
I have a double double pi = 3.1415; I want to convert this to a int array int[] piArray = {3,1,4,1,5}; I came up with this double pi = 3.1415; String piString = Double.toString(pi).replace(".", ""); int[] piArray = new int[piString.length()]; for (int i = 0; i <= piString.length()-1; i++) piArray[i] = piString.charAt(i) - '0'; It's working but I don't like this solution because I think a lot of conversions between datatypes can lead to errors. Is my code even complete or do I need to check for something else? And how would you approach this problem? I don't know straight way but I think it is simpler: int[] piArray = String.valueOf(pi) .replaceAll("\\D", "") .chars() .map(Character::getNumericValue) .toArray(); Since you want to avoid casts, here's the arithmetic way, supposing you only have to deal with positive numbers...