StrToFloat

function StrToFloat(FloatString string):Extended;

The StrToFloat function converts a number string, FloatString such as '123,456' into an Extended floating point number. It supports integer, floating point, and scientific (exponent) formats.

If a decimal point appears in FloatString, then it must match the current DecimalSeparator value.

Example:

var
  stringValue : string;
  floatValue  : float;

begin

  // Set up the source string containing a number representation
  stringValue := '123,456';

  // Convert it to a floating point number
  floatValue  := StrToFloat(stringValue);

  // And display the value
  ShowMessage(stringValue+' = '+FloatToStr(floatValue));

end;

Output:

123,456 = 123,456