import java.util.*;
public class example{
   public static int number1;
   public static int number2;
   public static int wholenum1;
   public static int wholenum2;
   public static int division1;
   public static int division2;
   public static int newn; //New;;;;;;;;;;
   public static int newd; //New;;;;;;;;;;
   public static void main(String[] args) { //Main method
      //Scanner scan = new Scanner(System.in);
      System.out.println("Welcome to FracCalc!");
      System.out.println("This version of Frat Calc supports (+, -, * and /)");
      System.out.println("Type quit to quit Frac Calc, and type test to test Frac Calc");
      System.out.println("Bye. Come again!");
   }// Ends main

   public static String produceAnswer2(String input) { //Method2
      boolean multipleoperations = false;
      String[] x = input.split(" "); //Splits the string apart
      String fraction1 = x[0];
      String operator = x[1];
      String fraction2 = x[2];
      String operand1 = parseOperands(fraction1); //Calls the ParseOperands method
      String operand2 = parseOperands(fraction2); //Calls the ParseOperands method
      String[] operand3 = operand1.split(" ");
      int wholenum1 = Integer.parseInt(operand3[1]);
      int numerator1 = Integer.parseInt(operand3[3]);
      int denominator1 = Integer.parseInt(operand3[5]);
      String[] finaloperand2 = operand2.split(" ");
      int wholenum2 = Integer.parseInt(finaloperand2[1]);
      int numerator2 = Integer.parseInt(finaloperand2[3]);
      int denominator2 = Integer.parseInt(finaloperand2[5]);
      String resultingnumbers = ("");
      int result = 0;
      int numeratoranswer = 0;
      int denominatoranswer = 0;
   }

   public static String Addition(String input) {
      if (operator.equals("+")) { //This if statment occurs when the user uses addition
         result = wholenum1 + wholenum2;
         numeratoranswer = (numerator1 * denominator2 + numerator2 * denominator1);
         denominatoranswer = (denominator1 * denominator2);
         numeratoranswer = result * denominatoranswer + numeratoranswer;
         result = 0;
         resultingnumbers = result + ("_") + numeratoranswer + ("/") + denominatoranswer;
      }

      if (operator.equals("-")) { //This if statment occurs when the user uses subtraction
         int num = 0;
         int num2 = 0;
         if (wholenum1 < 0) { //If statements below determine the numerators values
            num = wholenum1 * denominator1 - numerator1;
         }
         if (wholenum1 > 0) {
            num = wholenum1 * denominator1 + numerator1;
         }
         if (wholenum2 > 0) {
            num2 = wholenum2 * denominator2 + numerator2;
         }
         if (wholenum2 < 0) {
            num2 = wholenum2 * denominator2 - numerator2;
         }
         if (wholenum1 == 0) {
            num = numerator1;
         }
         if (wholenum2 == 0) {
            num2 = numerator2;
         }
         num *= denominator2;
         num2 *= denominator1;
         numeratoranswer = num - num2;
         denominatoranswer = denominator1 * denominator2;
         result = 0;
         resultingnumbers = result + ("_") + numeratoranswer + ("/") + denominatoranswer;
      }
      if (operator.equals("*")) { //This if statment occurs when the user uses multiplication
         numeratoranswer = (wholenum1 * denominator1 + numerator1) * (wholenum2 * denominator2 + numerator2);
         denominatoranswer = (denominator1 * denominator2);
         result = 0;
         resultingnumbers = result + ("_") + numeratoranswer + ("/") + denominatoranswer;
      }
      if (operator.equals("/")) { //This if statment occurs when the user uses division
         numerator1 = (wholenum1 * denominator1 + numerator1);
         numerator2 = (wholenum2 * denominator2 + numerator2);
         int temporarydenominator2 = denominator2;
         denominator2 = numerator2;
         numerator2 = temporarydenominator2;
         numeratoranswer = numerator1 * numerator2;
         denominatoranswer = denominator1 * denominator2;
         result = 0;
         resultingnumbers = result + ("_") + numeratoranswer + ("/") + denominatoranswer;
      }

      result = numeratoranswer / denominatoranswer;
      numeratoranswer = numeratoranswer % denominatoranswer;
      resultingnumbers = result + ("_") + (Math.abs(numeratoranswer)) + ("/") + (Math.abs(denominatoranswer));
      if (result == 0 && numeratoranswer == 0 && denominatoranswer == 1) {
         resultingnumbers = ("0");
         return resultingnumbers;
      }
      if (numeratoranswer == 0 && denominatoranswer == 1) {
         resultingnumbers = ("") + result;
         return resultingnumbers;
      }
      if (result == 0) {
         resultingnumbers = ("") + numeratoranswer + ("/") + denominatoranswer;
         return resultingnumbers;
      }
      return resultingnumbers;
   }


   public static String parseOperands(String operand2) { //Method 3
      boolean underscore = false;
      boolean fraction = false;
      boolean dividezero = false;
      String wholenum = ("");
      String fractionunparsed = ("");
      String numerator = ("");
      String denominator = ("");

      for (int j = 0; j < operand2.length(); j++) {
         if (operand2.charAt(j) == '_') { //If statement checks characters in String for an underscore
            underscore = true;
         }
         if (operand2.charAt(j) == '/') { //If statement checks characters in String for a dash
            fraction = true;
         }
      }
      if (underscore == true) { //If there's a underscore this will split the string into a fraction and a whole
         String[] components = operand2.split("_");
         wholenum = components[0];
         fractionunparsed = components[1];
      }
      else {
         if (fraction == true) { //If there's no underscore but there's a fraction this will be used
            wholenum = "0";
            fractionunparsed = operand2;
         }
         else { //If there's no underscore and no fraction this will be used
            wholenum = operand2;
            fractionunparsed = ("");
         }
      }
      if (fraction == true) { //If there's no fraction this will take the fraction and split it into the numerator and denominator of the fraction
         String[] fractions = fractionunparsed.split("/");
         numerator = fractions[0];
         denominator = fractions[1];
      }
      else { //If there's no fraction both the numerator and denominator are set to values of 0 and 1
         numerator = "0";
         denominator = "1";
      }
      String operand2parsed = "wholenumber: " + wholenum + " numerator: " + numerator + " denominator: " + denominator;
      if (denominator.equals("0")) {
         dividezero = true;
         return "dividebyzero";
      }
      return operand2parsed; //Returns operand2parsed
   }
}