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Literals (PHP and Corel Paradox Cross Reference Guide)

By Mike Prestwood

PHP versus Corel Paradox: A side by side comparison between PHP and Corel Paradox.

Language Basics

Language basics is kind of a catch all for absolute beginner stuff. The items (common names) I chose for language basics is a bit random and include items like case sensitivity, commenting, declaring variables, etc.

Literals

[Other Languages]

General Info: Programming Literals

A value directly written into the source code of a computer program (as opposed to an identifier like a variable or constant). Literals cannot be changed. Common types of literals include string literals, floating point literals, integer literals, and hexidemal literals. Literal strings are usually either quoted (") or use an apostrophe (') which is often referred to as a single quote. Sometimes quotes are inaccurately referred to as double quotes.

Languages Focus

In addition to understanding whether to use a quote or apostrophe for string literals, you also want to know how to specify and work with other types of literals including floating point literals. Some compilers allow leading and trailing decimals (.1 + .1), while some require a leading or trailing 0 as in (0.1 + 0.1). Also, because floating point literals are difficult for compilers to represent accurately, you need to understand how the compiler handles them and how to use rounding and trimming commands correctly for the nature of the project your are coding.

PHP: quote or apostrophe

In PHP you can use quotes, or apostrophes as in "Prestwood", and 'Prestwood' for string literals. Use a slash in front of a quote or apostrophe to embed same type as in \' and \".

To specify a floating point literal between 1 and -1, you can preceed the decimal with a 0 or not (both work). In other words, preceding and following decimals are allowed (both .1 and 0.1). Trailing decimals are also allowed (1, 1., and 1.0 are all equivalent and allowed).

Syntax Example:

echo "Mike's drums are over there.<br>";
echo 'Mike said, "hi!"<br>';

//Does PHP evaluate this simple

//floating point math correctly? No!

If ((.1 + .1 + .1) == .3) {
 Echo "Correct";
} Else {
 Echo "Not correct";
}

PHP Literals (quote or apostrophe)

Corel Paradox: quote

String literals are quoted as in "Prestwood". If you need to embed a quote use a slash in front of the quote as in \".

In ObjectPAL, string literals are limited to 255 characters but there's nothing preventing you from using multiple string literals together as in:

msgInfo("", "You can " + " add literals together in ObjectPAL")

Syntax Example: 1 certification question.

msgInfo("", "Hello")

msgInfo("", "Hello \"Mike\".")

;Does ObjectPAL evaluate this simple

;floating point math correctly? No!

If (.1 + .1 + .1) = .3 Then
 msgInfo("", "Correct")
Else
 msgInfo("", "Not correct")
EndIf