Реализация менеджера задач операционной системы — Pascal(Паскаль)

program PID;
uses crt;
type proc=record
     id:integer;
     rs:integer;
     numb:integer;
     time:integer;
     stime:integer;
     end;
mas_proc_type=array [1..3] of proc;
var res,pro,key,n,i,did:integer;mas_proc:mas_proc_type;label s,e,c,cont;

begin
randomize;
res:=100;pro:=0;n:=0;
s:clrscr;
writeln('----------PID-----------');
writeln;
writeln('=======MENU=========');
writeln('1)Add process');
writeln('2)Delete process');
writeln('3)Show all');
writeln('4)Exit');
readln(key);
case key of
1:   begin
     if (res=0) then
        begin
        writeln('There are no free resourses!');
        readln;readln;
        goto s;
        end;
     if (pro>3) then
        begin
        writeln('You cannot add another process!');
        readln;readln;
        goto s;
        end;
     write('Process time: '); read(mas_proc[pro+1].time);
     write('Quantity of resourses: '); read(mas_proc[pro+1].rs);
         if (mas_proc[pro+1].rs>res) then
         begin
         writeln('Too many resourses!');
         readln;
         goto s;
         end;
     mas_proc[pro+1].numb:=n+1;
     write('Starttime: '); read(mas_proc[pro+1].stime);
     mas_proc[pro+1].id:=random(100);
     for i:=1 to 3 do if (mas_proc[i].id=mas_proc[pro+1].id) then
         mas_proc[pro+1].id:=mas_proc[pro+1].id+random(10);
     writeln('Process have been added!');
     write('Process id:');textcolor(green);
     writeln(mas_proc[pro+1].id);textcolor(white);
     write('Process number:');textcolor(green);
     writeln(mas_proc[pro+1].numb);textcolor(white);
     readln;readln;
     res:=res-mas_proc[pro+1].rs;
     pro:=pro+1;n:=n+1;
     goto s;
     end;
2:   begin
     if (pro=0) then begin
        writeln('There is no process to delete!');
        readln;
        goto s;
        end;
     writeln('Write id of process you want do delete');
     readln(did);
     for i:=1 to 3 do
         if (did=mas_proc[i].id) then
         begin
         c:mas_proc[i].id:=0;
         res:=res+mas_proc[i].rs;
         if (i=2) then begin
          mas_proc[2].id:=mas_proc[3].id;
          mas_proc[2].rs:=mas_proc[3].rs;
          mas_proc[2].numb:=mas_proc[3].numb;
          mas_proc[2].time:=mas_proc[3].time;
          mas_proc[2].stime:=mas_proc[3].stime;
          end;
         if (i=1) then begin
          mas_proc[1].id:=mas_proc[2].id;
          mas_proc[1].rs:=mas_proc[2].rs;
          mas_proc[1].numb:=mas_proc[2].numb;
          mas_proc[1].time:=mas_proc[2].time;
          mas_proc[1].stime:=mas_proc[2].stime;
          mas_proc[2].id:=mas_proc[3].id;
          mas_proc[2].rs:=mas_proc[3].rs;
          mas_proc[2].numb:=mas_proc[3].numb;
          mas_proc[2].time:=mas_proc[3].time;
          mas_proc[2].stime:=mas_proc[3].stime;
          end;
         mas_proc[3].numb:=0;
         mas_proc[3].time:=0;
         mas_proc[3].stime:=0;
         mas_proc[3].rs:=0;
         pro:=pro-1;
         if (did=0) then goto cont;
         end;did:=0;
     readln;goto s;
     end;
3: begin
   for i:=1 to 3 do mas_proc[i].stime:=-mas_proc[i].stime;
   repeat
   cont:clrscr;
   writeln('г===T====T===========T======¬');
   writeln('¦ № ¦ ID ¦ Resources ¦ Time ¦');
   writeln('¦===+====+===========+======¦');
   for i:=1 to 3 do mas_proc[i].stime:=mas_proc[i].stime+1;
   delay(1000);
   if (mas_proc[1].stime>=mas_proc[1].time) then begin i:=1;goto c;end;
   if (mas_proc[1].numb<>0) then
   writeln('¦ ',mas_proc[1].numb,' ¦ ',mas_proc[1].id:2,' ¦ ',mas_proc[1].rs:7,'   ¦ ',mas_proc[1].stime:4,' ¦');
   if (mas_proc[2].stime>=mas_proc[2].time) then begin i:=2;goto c;end;
   if (mas_proc[2].numb<>0) then
   writeln('¦ ',mas_proc[2].numb,' ¦ ',mas_proc[2].id:2,' ¦ ',mas_proc[2].rs:7,'   ¦ ',mas_proc[2].stime:4,' ¦');
   if (mas_proc[3].stime>=mas_proc[3].time) then begin i:=3;goto c;end;
   if (mas_proc[3].numb<>0) then
      writeln('¦ ',mas_proc[3].numb,' ¦ ',mas_proc[3].id:2,' ¦ ',mas_proc[3].rs:7,'   ¦ ',mas_proc[3].stime:4,' ¦');
   writeln('L===¦====¦===========¦======-');
   until KeyPressed;
   readln;
   goto s;
   end;
4: begin
   writeln('Press enter');
   goto e;
   end;
end;
e:readln;
end.