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Home MathPack Math1 Comparison & Limiting IsValidDouble
See also: ScanFPNum, IsValidFPNum 

IsValidDouble

Unit:SDL_math1
Class: none
Declaration: function IsValidDouble (Instring: string; AllowExp: boolean; DecSeparator: TDecPSep): boolean;

The function IsValidDouble checks whether the string Instring contains a valid floating point number. Valid characters are the digits '0'...'9', 'E', '.', ',', leading '-' and '+' signs, and leading blanks. If the parameter AllowExp is set TRUE the scanned number may be optionally represented in exponential notation. The DecSeparator parameter controls which character is used as a decimal separator. It may take one of the following values:

dsDot the "." character (dot)
dsComma the "," character (comma)
dsBoth allows both the dot and the comma character
dsSystem the decimal separator is taken from the system locale


Last Update: 2023-Feb-06