Запусти Паскаль и введи программу: var
a,b,c:integer;
begin
a:=−19;
b:=abs(a);
writeln('abs(−19)=',b);
c:=sqr(b);
writeln('sqr(b)=',c);
c:=sqr(b+b);
writeln('sqr(b+b)=',c);
end.

При запуске программы вывод на экран:
abs(−19)=
sqr(b)=
sqr(b+b)=
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