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public static boolean registerVisit(ArrayList<Patient>patientList,  ArrayList<Visitor> visitorList) {
		boolean patientfound = false;
		boolean isdischarged=true;
		int num=0;
		int Pcount=0;
		int Vcount=0;
		boolean cont=true;
		while (Vcount<=4) {
			String Pname =Helper.readString("enter patient  name:  ");
			String Pward =Helper.readString("enter patient ward :  ");

			for (int i=0;i<patientList.size();i++) {
				if (Pname.equalsIgnoreCase(patientList.get(i).getName())&& Pward.equals(patientList.get(i).getWard())) {
					patientfound=true;

					if (cont==false) {
						break;
					}

					if ( patientList.get(i).getDatedischarged().isEmpty()==false)  {
						isdischarged=true;

					}
					if (patientfound==false) {
						System.out.println("name or ward is invalid ");
						System.out.println("please try again ! ");
					}

					if (patientfound==true && cont==true) {
						String nric4= Helper.readString("enter visitor 4 digit nric: ");
						String name =Helper.readString("enter visitor name:  ");
						String number  =Helper.readString("Enter contact number: ");
						String date_of_visit =Helper.readString("enter date of visit : ");
						Vcount=patientList.get(i).getVisitorcount()+1;
						Pcount=patientList.get(i).getVisitorcount()+1;
						patientList.get(i).setVisitorcount(Pcount);
						Visitor newvisitor =(new Visitor(nric4,name,Pname,Pward,number,date_of_visit));
						newvisitor.display();
						visitorList.add(new Visitor(newvisitor.getNric4(),newvisitor.getName(),newvisitor.getPname(),newvisitor.getPward(),newvisitor.getNumber(),newvisitor.getDate_of_visit()));
					}
					//					cont=Helper.readBoolean("Add another visitor: ");
					//					if (cont==false) {
					//						break;
					//					}

					if (4-(patientList.get(i).getVisitorcount())==0) {
						System.out.println("*** no additional visitor allowed  ***");

					} 
					else if (4-patientList.get(i).getVisitorcount()>0) {
						System.out.println("*** please proceed to ward  *** ");
						int extra =4-Pcount;
						System.out.println("*** only "+extra+" visitors allowed *** ");
						num=num+Pcount;
						patientList.get(i).setVisitorcount(num);
						if (Pcount> extra) {
							System.out.println("*** visitor exceeded ***");
						}
					} 
					else if (4-patientList.get(i).getVisitorcount()<0) {
						System.out.println("***visitor exceeded *** ");
					} 
					else if (isdischarged==true) {
						System.out.println("***patient has already been discharged***");
					}
					else if (patientList.get(i)==null ){
						System.out.println("***no such patient in ward ***");
					}
				}
			}

		}
		return patientfound;
	}