/**
* Calculates tip given the bill.
* @author Josh Wang
* @version 19 September 2017
*/
import java.util.*;
import java.text.DecimalFormat;
public class tipCalc{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
DecimalFormat format = new DecimalFormat("0.00"); //format for dollar.cents
boolean againPlease = true;
while (againPlease){
boolean num;
double bill;
double tip;
int count;
String in = "";
String test = "";
System.out.println();
do{
System.out.print("Enter cost of the bill. ");
in = sc.nextLine();
num = in.matches("[$\\d\\.]+"); //checks if input is $, digits, and periods
boolean exit = in.matches("exit"); //loop escape
if (exit)
System.exit(1);
int index = in.indexOf(".");
test = in.substring(index+1);
index = test.indexOf("."); //tests for more than one period
if (index >= 0)
num = false;
index = in.indexOf("$");
test = in.substring(index+1);
index = test.indexOf("$"); //tests for more than one $
if (index >= 0)
num = false;
test = in.substring(1);
index = test.indexOf("$"); //tests for noninitial $
if (index >= 0)
num = false;
if (num == false)
System.out.println("\nInvalid input!");
}while (num == false);
if (in.substring(0,1).matches("[$]") == true){ //tests for initial $
bill = (Double.parseDouble(in.substring(1)));
}
else{
bill = (Double.parseDouble(in));
}
System.out.println();
do{
System.out.print("How much would you like to tip (percent)? ");
in = sc.nextLine();
num = in.matches("[%\\d\\.]+"); //checks if input is %, digits, and periods
boolean exit = in.matches("exit"); //loop escape
if (exit)
System.exit(1);
int index = in.indexOf(".");
test = in.substring(index+1);
index = test.indexOf("."); //tests for more than one period
if (index >= 0)
num = false;
index = in.indexOf("%");
test = in.substring(index+1);
index = test.indexOf("%"); //tests for more than one %
if (index >= 0)
num = false;
test = in.substring(0,in.length()-1);
index = test.indexOf("%"); //tests for nonfinal %
if (index >= 0)
num = false;
if (num == false)
System.out.println("\nInvalid input!");
}while (num == false);
if (in.substring(in.length()-1).matches("[%]") == true){ //tests for final %
tip = (Double.parseDouble(in.substring(0,in.length()-1)));
}
else{
tip = (Double.parseDouble(in));
}
System.out.println("\nTip: $" + format.format(tip/100.0*bill));
System.out.println("Total: $" + format.format(bill+tip/100.0*bill));
System.out.println();
do{
System.out.print("How many people will be splitting the bill? ");
in = sc.nextLine();
num = in.matches("[\\d]+"); //checks if input is integer
//try{
// count = sc.nextInt();
//}catch(ArithmeticException e){System.out.println("Cannot divide by zero!");
//}catch(InputMismatchException e){System.out.println("Must be an integer!");
//}finally{num = false;}
boolean exit = in.matches("exit"); //loop escape
if (exit)
System.exit(1);
if (num == false)
System.out.println("\nInvalid input!");
if (Double.parseDouble(in) < 1){
System.out.println("\nSomeone has to pay!");
num = false;
}
}while (num == false);
double out = (Math.ceil(100*((bill+tip/100.0*bill)/Double.parseDouble(in))))/100.0; //rounds up each person's cost to next cent
System.out.println("\nEach person will pay $" + format.format(out) + ".");
if(out > (bill+tip/100.0*bill)/Double.parseDouble(in)){
System.out.println("You will pay an extra $" + format.format(((out*Double.parseDouble(in))-(bill+tip/100.0*bill))) + ".");
}
System.out.print("\nTo calculate again, press 1. Press any other key to exit. ");
int proceed = sc.nextInt();
if(proceed != 1)
againPlease = false;
}
}
}
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