Что значит число 7 в функции floattostrf​

Const nx=30;var i,j,p,n:integer;A:array[1..nx,1..nx] of integer;d,Sn,min:real;begin p:=1;write('Введите размер матрицы');Read(n);for i:=1 to n do beginfor j:=1 to n do beginA[i,j]:=random(3)-2;write(A[i,j]:4);end;writeln;end;writeln;writeln;for i:=1 to n do beginfor j:=1 to n do beginif i = j then begin if A[i,j]<> 0 then p:=p* A[i,j];write(A[i,j]:4);endelse write(' ':4);end;writeln;end;write('p =',p);writeln;writeln;for i:=1 to n do beginfor j:=1 to n do beginif (i= n -j +1) then begin if A[i,j]<> 0 then p:=p* A[i,j];write(A[i,j]:4);endelse write(' ':4);end;writeln;end;write('p =',p);end.

Class OftenChar{
 public static void main(String args[]){
  java.util.Scanner in = new java.util.Scanner(System.in);
  String string = in.nextLine(); char chars[] = new char[4];
  chars[0] = in.nextLine().charAt(0); chars[2] = in.nextLine().charAt(0);
  for(int sChar = 0; sChar<string.length(); sChar++)
   if(string.charAt(sChar)==chars[0])chars[1]++;
   else if(string.charAt(sChar)==chars[2])chars[3]++;
  System.out.print("\n"+(chars[1]==chars[3]?chars[0]+""+chars[2]:chars[1]>chars[3]?chars[0]:chars[2]));
 }
}