Round

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The RTL System unit contains function Round, which rounds a Real-type value to an Integer-type value. It's input parameter is a real-type expression and Round returns a Int64 value that is the value of the input rounded to the nearest whole number. If the input value is exactly halfway between two whole numbers - N.5 - then "bankers rounding" is used, with the result being the nearest even number.

Declaration

function Round(X: Real): int64;

Example Usage

begin
   WriteLn( Round(8.7) );
   WriteLn( Round(8.3) );
   // examples of "bankers rounding" - .5 is adjusted to the nearest even number
   WriteLn( Round(2.5) );
   WriteLn( Round(3.5) );
end.

Output

 9
 8
 2
 4

See also

• system.round
• math.ceil - round up
• math.floor - round down
• frac - returns the fractional part of a floating point value
• trunc - round towards zero
• int - returns the integer part of a floating point value
• div - integer division
• Comparison of approaches for rounding to an integer