Java;Notes - 9.) Conversions between Numeric Types

This next part is better shown with a graph.

• Solid lines indicate conversions that will not lose precision in the numbers
• Dashed lines will lose some precision if converted.

So if you take int: 123456789 and you want to make it into a "Float" all you need to do is

• int n = 123456789
• float f = n  

This will cause the final outcome to take 123456789 and turn it into 1.23456792E8 Notice everything is accurate up to seven?

Lastly a few rules to keep in mind:

• If either of the operands is of type double, the other one will be converted to a double.
• Otherwise, if either of the operands is of type float, the other one will be converted to a float.
• Otherwise, if either of the operands is of type long, the other one will be converted to a long.
• Otherwise both operands will convert to an int.

Java Casts:

As we learned in the above made section you can convert an integer to a double now it stands to reason that you might sometimes want to convert a double back to an integer. Java adds a thing called "Cast" into mix. Casts are used anytime you want to do a conversion that will result in loss of accuracy. The syntax for it is simple like so:

1. double x = 9.9998
2. int nx = (int) x; 

This should print out: 9 as the result when nx is called in a print statement here is the proof:

Rounding numbers up:
If you wish to round a double to its next best option the syntax for that is simple as well:

1. double x = 9.9998
2. int nxr = (int) Math.round(x); 

The following image shows the code and the output:

Well that is all I have for this round! Thanks for tuning in!