Укажите правильные варианты использования инструкции вывода данных print('z='+z) print('z=', z) print (a+b) print('a') print("z=" + z) print('z=", z) print('a=' a)

// PascalABC.NET 3.1, сборка 1256 от 21.06.2016
function IsPrime(n:integer):boolean;
begin
  if n<4 then Result:=True
  else begin
    var found:= (n mod 2 = 0);
    var p:=3;
    while (not found) and (sqr(p)<=n) do
      begin
      found:=(n mod p = 0);
      p+=2
      end;
    Result:=not found
    end
end;

begin
  Range(100,999).Where(n->IsPrime(n)).Println(',')
end.

Результат
101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503,509,521,523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,751,757,761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997

//Pascal ABC.NET 3.1 сборка 1256

uses
 GraphABC;

 Var
 n:integer;

 procedure square(var n:integer);
begin
readln(n);
rectangle(window.Center.X-n div 2,window.Center.Y-n div 2,window.Center.X+n div 2,window.Center.Y+n div 2);
end;

procedure points(n:integer);
Var
 x,y,i:integer;
begin
i:=0;
while i<1000 do
 begin
  x:=random(window.Center.X-n div 2+1,window.Center.X+n div 2-1); 
y:=random(window.Center.Y-n div 2+1,window.Center.Y+n div 2-1);
  setpixel(x,y,rgb(random(255),random(255),random(255)));
  inc(i);
 end;
end;

begin
randomize;
square(n);
points(n);
end.