int num = 5;
int denom = 7;
double d = num / denom;

double d = ((double) num) / denom;

double num = 5;

double d = num * 1.0 / denom;

double d = num / (double) denom;

double d = 5 / (double) 20; //cast to double, to do floating point calculations

double d = (double)(5 / 20); //produces 0.0

1. double d = (double)5 / 20;
2. double v = (double)5 / (double) 20;
3. double v = 5 / (double) 20;

double d = (double)(5 / 20); //produces 0.0

double step = 1d / 5;

class Utils
{
    public static double divide(int num, int denom) {
        return ((double) num) / denom;
    }
}