MORE ABOUT VARIABLES
Variables must begin with a character or underscore, and may be followed by any combination of characters, underscores, or the digits 0 - 9. The following is a list of valid variable names,
summary exit_flag i Jerry7 Number_of_moves _valid_flag
You should ensure that you use meaningful names for your variables. The reasons for this are,
CLASS EXERCISE C3
Why are the variables in the following list invalid,
value$sum exit flag 3lotsofmoney char
VARIABLE NAMES AND PREFIXES WHEN WRITING WINDOWS OR OS/2
During the development of OS/2, it became common to add prefix letters to variable names to indicate the data type of variables.
This enabled programmers to identify the data type of the variable without looking at its declaration, thus they could easily check to see if they were performing the correct operations on the data type and hopefully, reduce the number of errors.
Prefix Purpose or Type b a byte value c count or size clr a variable that holds a color f bitfields or flags h a handle hwnd a window handle id an identity l a long integer msg a message P a Pointer rc return value s short integer ul unsigned long integer us unsigned short integer sz a null terminated string variable psz a pointer to a null terminated string variable
In viewing code written for Windows or OS/2, you may see variables written according to this convention.
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