Pascal Repeating a Program Untill A String Variable is Empty -

so i'm writing program pascal , asking me repeat program until no name entered this exact question if helps

so found out meaning null/empty in pascal '' tried different codes last 1 tried

program lunch; const   dues_percentage1=0.3;     dues_percentage2=0.2;     var       name:string;       age:integer;       lunch_money:real;       dues:real; begin   while name <> ''   writeln('please enter name');   read(name);   writeln('please enter age');   read(age);   writeln('please enter amount of money receive');   read(lunch_money);   if age >10   dues:= lunch_money*dues_percentage1   else   dues:= lunch_money*dues_percentage2;   writeln('the amount of lunch money receive $',lunch_money:4:2);   writeln('the amount of dues pay $',dues:3:2);   readln(dues,lunch_money); end. 

and doesn't work appreciate help.

the problem if use while loop, need initialise "name" before make test (and read before each next test within loop). example:

 var    name : string;  begin    //initialise name    readln(name);    while name <> ''    begin      // stuff here      // , here      //then read next name      readln(name);    end;  end; 

note while carries out next statement (if condition true), need use compound statement if want while more 1 statement.

if use repeat until may need different structure:

 var    name : string;  begin    repeat      readln(name);      if name <> ''      begin         // stuff here         // , here      end;    until name = '';  end;