Docs

Appearance

Round2 ​

The Round2 function returns the specified aValue rounded to the number of decimal places given by aDigit.

This function performs traditional biased rounding, where the ending decimal value of 1-5 is rounded down, and 6-9 is rounded up.

Where aDigit is 0, the function applies the same rules, but just returns the integer –

  • Round2(4.2,0) is 4.
  • Round2(4.5,0) is 4.
  • Round2(4.8,0) is 5.

For a function that always rounds 0.5 up, refer to Round2Up.

Declaration: Function Round2(aValue : Extended; aDigit : integer) : Extended

Examples are as below.

pascal
Procedure OnMapEvent(var Value:variant);
begin
  Value:= Round2(745.454,2);                  // result is 745.45
  Value:= Round2(745.455,2);                  // result is 745.45
  Value:= Round2(745.456,2);                  // result is 745.46
  Value:= Round2(745.4558,3);                 // result is 745.456
  Value:= Round2(745.4553,3);                 // result is 745.455
  Value:= Round2(745.554,2);                  // result is 745.55
  Value:= Round2(745.555,2);                  // result is 745.55
  Value:= Round2(745.556,2);                  // result is 745.56
  Value:= Round2(745.5558,3);                 // result is 745.556
  Value:= Round2(745.5553,3);                 // result is 745.555

  LogInfo(FloatToStr(Round2(745.5553,0)));    // result is 746
  LogInfo(FloatToStr(Round2(745.5453,0)));    // result is 745
  LogInfo(FloatToStr(Round2(745.4553,0)));    // result is 745
  LogInfo(FloatToStr(Round2(745.5,0)));       // result is 745
  LogInfo(FloatToStr(Round2(745.6,0)));       // result is 746
  LogInfo(FloatToStr(Round2(666.777,2)));     // result is 666.78
end;