Any of the above works for fractional division purposes! 

Another case is when a variable is used.
If the variable is of type float or double, the division is not rounded.
Otherwise, a cast operator or a functional converter is necessary:

float num1 = 3;
int num2 = 3;

println( num1 / 4 );  // it works since var is a float already!

println( num2 / 4 );  // integer division: both var & literal are of integer types!

println( num2 / 4e0 ); // works too: literal is a float!

println( (float) num2 / 4 ); // works as well: cast operator made var a float!

exit();