Always Round UP a Double

Question

How could I always round up a double to an int, and never round it down. I know of Math.round(double), but I want it to always round u

Answer 1

In simple words,

• Math.ceil will always round UP or as said above, in excess.
• Math.round will round up or down depending on the decimals.
  • If the decimal is equal or higher than 5, then it's rounded up.
    • decimal => 5. (1,5 = 2)
  • If the decimal is less than 5, then it's rounded down.
    • decimal < 5. (1,45 = 1)

Examples of Math.ceil and Math.round:

The code Below would return:
Cost, without Ceil 2.2 and with Ceil 3 (int), 3.0 (double). If we round it: 2

    int m2 = 2200;
    double rate = 1000.0;

    int costceil = (int)Math.ceil(m2/rate);
    double costdouble = m2/rate;
    double costdoubleceil = Math.ceil(m2/rate);
    int costrounded = (int)Math.round(m2/rate);
    System.out.println("Cost, without Ceil "+costdouble+" and with Ceil "+
            costceil+"(int), "+costdoubleceil+"(double). If we round it: "+costrounded);

If we change the value of m2 to for example 2499, the result would be: Cost, without Ceil 2.499 and with Ceil 3 (int), 3.0 (double). If we round it: 2
If we change the value of m2 to for example 2550, the result would be:
Cost, without Ceil 2.55 and with Ceil 3 (int), 3.0 (double). If we round it: 3

Hope it helps. (Information extracted from previous answers, i just wanted to make it clearer).