Debugging Your Application

Printing

There are three pretty-printing routines that will print out values to the Inspector window. While each one can print arrays and frames in a readable manner, they differ in small details, as shown in TABLE 8.1.

Differences among Print, Display, and Write.
Print Display Write
Appends a new line after printing. X
Surrounds strings with double quotes (e.g., "Hello"). X X
Prints dollar sign before characters (e.g., $H). X X

Differences among `Print`, `Display`, and `Write`.
	`Print`	`Display`
Appends a new line after printing.	X
Surrounds strings with double quotes (e.g., `"Hello"`).	X	X
Prints dollar sign before characters (e.g., `$H`).	X	X

Here are some examples that demonstrate these differences among Print, Display, and Write. The following code for Print:

Print("Hello"); Print($W); Print("orld");

produces

"Hello"
$W
"orld"

Using Display instead:

Display("Hello"); Display($W); Display("orld");

produces

"Hello"$W"orld"

Finally, using Write for the same text:

Write("Hello"); Write($W); Write("orld");

produces

HelloWorld

Controlling the Depth of Printing
Controlling the Number of Slots Printed

An online version of Programming for the Newton using Macintosh, 2nd ed. Š1996, 1994, Julie McKeehan and Neil Rhodes.

Last modified: 1 DEC 1996