Language basics - JavaTech: An Introduction to Scientific and Technical Computing with Java - page 52

Until J2SE 5.0, Java separated formatting from input and output operations.
Yo u first formatted numbers into a string and then printed the string or displayed
it graphically. In Section 5.11 we discuss formatting with the new tools in Java
5.0 that provide combined formatting/output capabilities similar to those of the
printf() function in C.

2.12.2 Floating-point demo
As discussed in Section 2.11, you must deal with several aspects of floating-
point representations and operations when doing numerical computations. The
following code illustrates some of these floating-point issues:

// FP literals are double type by default.
// Append F or f to make float, or cast to float
float x = 5.1f;
float y = 0.0f;
float z = (float) 1.0;

float div - by - zero = x/y;
System.out.println ("Divide By Zero = x/y ="+
div - by - zero);

x = -1.0f;
div - by - zero = x/y;
System.out.println ( " Divide negative value by zero = x/y ="
+ div - by - zero);

x = 2.0e-45f;
y = 1.0e-10f;
float positive - underflow = x*y;
System.out.println ("Positive underflow ="
+ positive - underflow);

x = -2.0e-45f;
y = 1.0e-10f;
float negative - underflow = x*y;
System.out.println ("Negative underflow ="
+ negative - underflow);

x = 1.0f;
y = negative - underflow;
float div - by - neg - zero = x/y;
System.out.println("Divide 1 by negative zero ="+
div - by - neg - zero + " \ n");

x = 0.0f;
y = 0.0f;
float div - zero - by - zero = x/y;
System.out.println ( " Divide zero by zero =" +
div - zero - by - zero);