Identifiers

A identifiers can be defined as the name of the variables and some other programme  elements using the combination of the following characters

• Alphanumeric characters ( a ~ z , A～Z , 0～9 ) and half underscore ( _ ) can only be used.
• The first character of the first contain letters ( a ~ z , A～Z ) or half underscore ( _ ) can only be used.
• Case is distinguishable. That is, word and WORD is recognized as a separate identifier.
• Reserved words are not allowed. However, part of an identifier reserved words can be included.

Examples of valid Idendifiers:

Sam, SUE, _go, nUmBeR, V1,v2,V3