test27, Pascal - rextester

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//fpc 3.0.4
{record with variable part "case"}
program test27;
type  fig=(circle,quadra);
          Pfig=^Figure;
           Figure=record 
                        sled: Pfig;
                          case f:fig of
                              circle:(r:real);
                               quadra:(a,b:real) {"a" gets the space of "r"}
                        end;
 var m,q:Pfig;     
function square(x:Pfig):real;
begin
    with x^ do
         case f of
            circle: square:=3.14*sqr(r);
            quadra:square:=a*b ;        
         end;    
end;
begin
New(m);
with m^ do
      begin
         sled:=Nil;
         f:=circle;
          r:=10;
          b:= 3;
          writeln(r:2:1);
          writeln(b:2:1);           
        end;
writeln(square(m):2:1) ;
writeln;
New(q);
with q^ do
      begin
         sled:=m;
         f:=quadra;
         r:=2;
          {a:=1;}{"a" gets the space of "r"}
          b:= 3;
          writeln(r:2:1);
          writeln(b:2:1);
       end;
   writeln(square(q):2:1) ; 
   writeln(square(q^.sled):2:1) ;            
   Dispose(q);     
end.

Show compiler warnings [ + ] Show input
Compilation time: 0.12 sec, absolute running time: 0.18 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 0,44 sec