How to set number of decimals?

Hello!

I thought that I know this but I did not, very annoying!

I got code like this:

float x

public void updateX(int x)
{
    this.x = this.x + (x/100f);
    System.out.println((this.x + (x/100f)));
}

I only want 2 decimal for x but I get like 8!!

For eg if I call updateX like below when x is 0.04:

updateX(1);

I get this value at x: 0.049999997 but I would like 0.05!


So if any one have the solution please let me know cause I know there is some way to set the number of digits in the decimalpart.

Best regards

Fredrik