if statements
  

There are two forms of if statement: if...then and the if...then...else. Like normal pascal, if the if expression is true, the statement (or block) is executed. If there is else part and expression is false, statement (or block) after else is execute.

Examples:

if J <> 0 then Result := I/J;

if J = 0 then Exit else Result := I/J;

if J <> 0 then
begin
  Result := I/J;
  Count := Count + 1;
end else
  Done := True;