program ifChecking;

​

var

{ local variable declaration }

   a:integer;

​

begin

   a:= 10;

   (* check the boolean condition using if statement *)

​

   if( a < 20 ) then

      (* if condition is true then print the following *)

      writeln('a is less than 20 ' );

   writeln('value of a is : ', a);

end.