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Data Types and Literals
Part:
1
2
(Continued from previous part...)
To show you some examples of data literals, I wrote the following script, data_literal.html:
<html>
<body>
<!-- data_literal.html
Copyright (c) 2006 by Dr. Herong Yang. http://www.herongyang.com/
-->
<pre>
<script language="vbscript">
document.writeln(777)
document.writeln(777777)
document.writeln(0.00314159e30)
document.writeln(333.333e200)
document.writeln(999999.5555)
document.writeln("Hello")
document.writeln(TRUE)
document.writeln(#31-Dec-1999#)
document.writeln("No literals for variant data type.")
</script>
</pre>
</body>
</html>
If you open this script in IE, you will get:
777
777777
3.14159E+27
3.33333E+202
999999.5555
Hello
True
12/31/1999
No literals for variant data type.
Couple of interesting notes here:
- The "writeln" procedure of the "document" object is used to write text into the HTML document.
- Line 3 shows that VB normalized my value into the standard single-precision floating point format.
- Line 4 shows that VB normalized my value into the standard double-precision floating point format.
- Line 7 shows that VB keywords are not case sensitive. Key word TRUE is the same as True.
- Line 8 shows that VB recognize more than one date format. Both dd-MMM-yyyy and mm/dd/yyyy are valid.
More on String Literals
String literals have one additional rule:
- If a double quote (") is part of a string literal, the double quote needs to be prefixed with another double quote.
I have the following script, string_literal.html, to show you how to include double quotes in string literals:
<html>
<body>
<!-- string_literal.html
Copyright (c) 2006 by Dr. Herong Yang. http://www.herongyang.com/
-->
<pre>
<script language="vbscript">
document.writeln("Ding...")
document.writeln("He said: ""Hello?""")
document.writeln("She said: ""Hello, Who's calling?""")
</script>
</pre>
</body>
</html>
Here is the output:
Ding...
He said: "Hello?"
She said: "Hello, Who's calling?"
Conclusions
- 9 basic data types supported in VB.
- String literals are enclosed in (").
- ("") represents (") in string literals.
- Date literals are enclosed in (#).
Part:
1
2
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