Thread: Cannot obtain ' and " in my program

Hello everyone,
Thanks for trying to help me.

The program that I am working on is supposed to ask a person for their input in feet and inches

2' 2 2/2" <--- (This format)

However, I cannot come up with a way that enables such kind of user input.

The program is composed of three classes

Fraction

Pair

Mix

<!-- Java: ... -->

 import java.util.Scanner;
    class Mix extends Fraction{
 
      public Mix ( int n, int m) 
      {
      super (n,m);
      }
 
      public String displayMix() 
      {
      String str="";
      if (first < second) 
      str=first+ "'" + first%second +"/"+second+"\"";
      else 
      str=first+"'" +(first+second)+"/"+second+"\"";
 
      return str; 
      } //display
 
    public static String get ()
    {
      Scanner scan = new Scanner(System.in);
      System.out.print("Please enter a mixed-format number:");
      String userInput = scan.nextLine();
      userInput = userInput.trim();
      System.out.println("Input is: "+ userInput);
      return (userInput);
    } //get
 
 
      public static void main(String [] args)
      {
      String userInput;
      int[]iA = {0,0,0,1};
 
      userInput = Mix.get();
      iA=parse(userInput);
      Mix f = new Mix ( iA[0] , (iA[1]*iA[2])+(iA[3]) );
      System.out.println("Number = " + f.displayMix());
 
      userInput = Mix.get();
      iA=parse(userInput);
      Mix g = new Mix ( iA[0] , iA[1] * iA[3] + iA[2]);
      System.out.println("Number = " + g.displayMix());
 
      Mix h = Mix.add (f,g);
      System.out.println("Sum ="+ h.displayMix());
      } // main
 
 
      public static Mix add (Mix f, Mix g){
      int gtop=       f.first+g.first;
 
      int gbottom=    f.second+g.second;
      return(new Mix ( gtop, gbottom));
      } //add
 
 
    public static int[] parse (String userInput){
    int [] sA = {0,0,0,1};
    int pos = userInput.indexOf("'");
 
    String sNum0 = userInput.substring(0,pos);
    pos = userInput.indexOf("'");
    sA[0]= Integer.parseInt(sNum0);
 
    String sNum = userInput.substring(0,pos);
    pos = sNum.indexOf("  ");
    sA[1]= Integer.parseInt(sNum);
 
    String sNum2 = userInput.substring(pos + 1);
    pos = sNum2.indexOf("/");
 
    String sTop= sNum2.substring (pos +3);
    pos = sNum2.indexOf("\"");
    sA[2] = Integer.parseInt(sTop);
 
    String sBot = sNum2.substring(pos +1);
 
    sA[3] = Integer.parseInt(sBot);
 
    // 2' 2 2/2
    return (sA);
    }} //parse

I have managed to get result after inputting

2' 2 2/2"1

I don't know what I am doing wrong, but something is off since i need a number after the " to get a result back.

I am pretty sure that something is wrong with the parsing method, i just dont know where it is.

If you test the program you will see that the results for the numbers are not correct, I am aware of this issue, but I want to nail down the input
so that later on i can deal with the computational issues with more ease.

This is the Fraction class

   public class Fraction extends Pair{
    //attributes: NONE
 
 
    public Fraction(int n, int m) {
    super(n,m);
    int g=gcd(n,m);
    first = first;
    second=second/g;
    }//Fraction
 
 
    public void display2() {
    System.out.print(first);
    System.out.print("/");
    System.out.println(second);
    }//display
 
 
    public Fraction add (Fraction f1, Fraction f2){
    int gtop=f1.first * f2.second
    + f2.first * f1.second;
    int gbottom= f1.second * f2.second;
    return (new Fraction(gtop,gbottom));
    }
 
 
    public static int gcd (int n, int m){
    while ( n!=m) {
    if (n>m) n=n-m;
    else m=m-n;
    }//while
    return (n);
    } //gcd
    } //class

This is the third class

    public class Pair {
    int first;
    int second;
 
    public Pair(int n, int m) {
    first=n;
    second=m;
    }//Pair
 
 
    public void display() {
    //pseudo_code is here
    System.out.print("First integer="+first);
    System.out.println();
    System.out.println("Second integer="+second);
    }//display
 
 
    public static void main(String[] args) {
    //pseudo-code is here
    Pair f= new Pair(2,4);
    f.display();
    }//main
    } //class

Did you mean:

2", 2', 2"/2' ?

You could do this:

String parseMe = input.nextLine();

String[] inputs = parseMe.split(" ");

Now, you should have

inputs[0] = 2'
inputs[1] = 2
inputs[2] = 2/2"

Also, to parse the last one, use the String method valueOf(char) to get around the usual possible syntax errors with those pesky double quotes.

i.e.

String quotes = String.valueOf('"');


To further break down the 2/2", you could do a further split on it

String[] inputs2 = inputs[2].split("/");


I'm afraid I don't understand what all of the stuff means. Particularly what 2/2"1 means. However, as long as there are only spaces between the different types of input

i.e.

2' 2 2/2" 2/2"1 then it should work with my String split(" ") method call in separating them all.

Again, I'm not quite sure what 2/2" and 2/2"1 represent so I can't be for certain on what to do, but did I help at all?