Difference between revisions of "DEFSNG"

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* You can also use commas for specific untyped variable first letters.
 
* You can also use commas for specific untyped variable first letters.
 
* Variables [[DIM]]ensioned as another variable type or that use type suffixes are not defined otherwise.
 
* Variables [[DIM]]ensioned as another variable type or that use type suffixes are not defined otherwise.
* DEFSNG is normally the Qbasic default assignment for undefined variables anyhow.
+
* DEFSNG is normally the Qbasic default type assignment for undefined variables without type suffixes.
 +
* _DEFSNG sets the [[type]] of all variable names with the starting letter(s) or letter ranges  when encountered in the progression of the program(even in conditional statement blocks not executed and subsequent [[SUB]] procedures).  
 
* '''Qbasic's IDE may add DEF statements before any [[SUB]] or [[FUNCTION]]. QB64(like QB) will change all variable types in subsequent sub-procedures to that default variable type without giving a [[ERROR Codes|"Parameter Type Mismatch"]] warning or adding the proper DEF statement to subsequent procedures! If you do not want that to occur, either remove that DEF statement or add the proper DEF type statements to subsequent procedures. May also affect [[$INCLUDE]] procedures!'''
 
* '''Qbasic's IDE may add DEF statements before any [[SUB]] or [[FUNCTION]]. QB64(like QB) will change all variable types in subsequent sub-procedures to that default variable type without giving a [[ERROR Codes|"Parameter Type Mismatch"]] warning or adding the proper DEF statement to subsequent procedures! If you do not want that to occur, either remove that DEF statement or add the proper DEF type statements to subsequent procedures. May also affect [[$INCLUDE]] procedures!'''
 
* '''Warning: Qbasic keyword names cannot be used as numerical variable names with or without the type suffix!'''
 
* '''Warning: Qbasic keyword names cannot be used as numerical variable names with or without the type suffix!'''

Revision as of 08:03, 11 February 2013

The DEFSNG statement defines all designated undefined variables AS SINGLE variables.


Syntax

DEFSNG firstletters


  • The variable first letters can be from A-Z or any other range.
  • You can also use commas for specific untyped variable first letters.
  • Variables DIMensioned as another variable type or that use type suffixes are not defined otherwise.
  • DEFSNG is normally the Qbasic default type assignment for undefined variables without type suffixes.
  • _DEFSNG sets the type of all variable names with the starting letter(s) or letter ranges when encountered in the progression of the program(even in conditional statement blocks not executed and subsequent SUB procedures).
  • Qbasic's IDE may add DEF statements before any SUB or FUNCTION. QB64(like QB) will change all variable types in subsequent sub-procedures to that default variable type without giving a "Parameter Type Mismatch" warning or adding the proper DEF statement to subsequent procedures! If you do not want that to occur, either remove that DEF statement or add the proper DEF type statements to subsequent procedures. May also affect $INCLUDE procedures!
  • Warning: Qbasic keyword names cannot be used as numerical variable names with or without the type suffix!


Example: DEFSNG A-D, S


See also:



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