ZBasic Language Reference
34
ZBasic Microcontrollers
Examples
Dim i as Integer
Dim s as String
Console.WriteLine(CStr(i))
Console.WriteLine("i = " & CStr(i))
Console.Write("s = ")
Console.WriteLine(s)
Console.WriteLine("")
This sequence of statements is written to produce exactly the same result as the sequence of
Debug.Print statements above. Note how the string concatenation operation is used in the second
Console.WriteLine() invocation to produce a single string. In the final example, an empty string is
output followed by a carriage return/line feed.
Note that there are counterparts to these statements called Console.Read and Console.ReadLine that
allow you to retrieve data from the Com1 serial port. However, these are technically functions (since they
both return a value) and are therefore not described here. See the ZBasic System Library Reference
manual for information on these functions.
2.5.5 Debug.Print Statement
One technique for debugging a program is called “print statement debugging”. The idea is that to
determine how your program is executing you insert statements into the program that display the values
of important variables or simply display a distinctive message so that you know what the program is
doing. Debug.Print is a special statement intended just for this purpose. The syntax is:
Debug.Print [<string-list>][;]
The <string-list> element represents zero or more string expressions separated from one another
by a semicolon. Each of the string expressions is evaluated in turn, from left to right, and the string result
of each is output to the console channel. If the optional trailing semicolon is omitted, a carriage return/line
feed will also be output so that the next time something is output to the console channel it will appear on a
new line. If you don’t want the subsequent output to be on a new line, simply add the semicolon at the
end of the list. This is often done when you need to compute several different values to output. You can
use a separate Debug.Print statement for each value and keep them all on the same output line by
ending all but the last with a semicolon. It is permitted, syntactically, to specify an empty string list but still
include the trailing semicolon. However, this construction does nothing.
Note that each of the items to be displayed must be a string. You can use the CStr() function to
produce a string from any value.
Examples
Dim i as Integer
Dim s as String
Debug.Print CStr(i)
Debug.Print "i = ";CStr(i)
Debug.Print "s = ";
Debug.Print s
Debug.Print
The last example, with an empty <string-list> and no trailing semicolon, will simply send a carriage-
return/linefeed to the console channel.
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