System.SysUtils.StrToFloat
Delphi
function StrToFloat(const S: string): Extended;
function StrToFloat(const S: string; const AFormatSettings: TFormatSettings): Extended;
C++
extern DELPHI_PACKAGE System::Extended __fastcall StrToFloat(const System::UnicodeString S)/* overload */;
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| function | public | System.SysUtils.pas System.SysUtils.hpp |
System.SysUtils | System.SysUtils |
Description
Converts a given string to a floating-point value.
Use StrToFloat to convert a string, S, to a floating-point value (leading and trailing blanks are ignored).
Smust consist of an optional sign (+ or -), a string of digits with an optional decimal point, and an optional mantissa.- The mantissa consists of 'E' or 'e' followed by an optional sign (+ or -) and an optional number.
The DecimalSeparator global variable or its TFormatSettings equivalent defines the character that is used as a decimal point. Thousand separators and currency symbols are not allowed in the string. If S does not contain a valid value, StrToFloat raises an EConvertError exception.
The first form of StrToFloat is not thread-safe, because it uses localization information contained in global variables. The second form of StrToFloat, which is thread-safe, refers to localization information contained in the AFormatSettings parameter. Before calling the thread-safe form of StrToFloat, you must populate AFormatSettings with localization information. To populate AFormatSettings with a set of default locale values, call TFormatSettings.Create.