Question

Must write in Java - ignore the Junit tests

Write a program that works with fractions. You are first to implement three methods, each to perform a different calculation on a pair of fractions: subtract, multiply, and divide. For each of these methods, you are supplied two fractions as arguments, each a two-element array (the numerator is at index 0, the denominator is at index 1), and you are to return a resulting, simplified fraction as a new two-element array (again, with the numerator at index 0, and denominator at index 1). You have been provide an add method as an example. You must compute the resulting fraction using fraction-based math (working with numerators and denominators) – do not convert the fractions to double values (like 1.5), do the math, and convert back to a fraction. You have been provided a method to simplify a fraction using the gcd method from the previous lab. Once the operation methods are complete and pass the JUnit tests, now focus your attention on the main method. You first need to input the two fractions from the keyboard (numerator then denominator for each; you can assume integers) as well as one of the four valid operations (+, -, *, /). Then validate the inputs: make sure a valid operation was input, make sure neither of the denominators are zero, and make sure that the numerator of the second fraction isn’t zero if the operation is division (error messages have been provided for each of these situations). Finally, compute the result of the operation and output the answer. Note that if the denominator of the answer is 1, you should just output the numerator (this includes if the answer is 0). Here are two example runs of the program:

Enter the numerator for the first fraction: 1

Enter the denominator for the first fraction: 2

Enter the numerator for the second fraction: -4

Enter the denominator for the second fraction: 8

Enter the operation (+, -, *, /): +

1/2 + -4/8 = 0

Enter the numerator for the first fraction: 7

Enter the denominator for the first fraction: 8

Enter the numerator for the second fraction: 1

Enter the denominator for the second fraction: 3

Enter the operation (+, -, *, /): -

7/8 - 1/3 = 13/24

Answer 1

Here is the code for you:

import java.util.*;
class FractionAsArrays
{
public static int gcd(int num1, int num2)
{
if(num1 == 0)
return num2;
else if(num2 == 0)
return num1;
else
return gcd(num2, num1 % num2);
}
public static int[] reduce(int[] number)
{
int temp = gcd(number[0], number[1]);
number[0] /= temp;
number[1] /= temp;
return number;
}
public static int[] add(int[] first, int[] second)
{
int[] result = new int[2];
result[0] = first[0]*second[1] + second[0]*first[1];
result[1] = first[1]*second[1];
return reduce(result);
}
public static int[] sub(int[] first, int[] second)
{
int[] result = new int[2];
result[0] = first[0]*second[1] - second[0]*first[1];
result[1] = first[1]*second[1];
return reduce(result);
}
public static int[] mul(int[] first, int[] second)
{
int[] result = new int[2];
result[0] = first[0] * second[0];
result[1] = first[1] * second[1];
return reduce(result);
}
public static int[] div(int[] first, int[] second)
{
int[] result = new int[2];
result[0] = first[0] * second[1];
result[1] = first[1] * second[0];
return reduce(result);
}
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
int[] firstNumber = new int[2];
int[] secondNumber = new int[2];
int[] resultNumber = new int[2];
System.out.print("Enter the numerator for the first fraction: ");
firstNumber[0] = sc.nextInt();
System.out.print("Enter the denominator for the first fraction: ");
firstNumber[1] = sc.nextInt();
  
System.out.print("Enter the numerator for the second fraction: ");
secondNumber[0] = sc.nextInt();
System.out.print("Enter the denominator for the second fraction: ");
secondNumber[1] = sc.nextInt();
if(firstNumber[1] == 0 || secondNumber[1] == 0)
{
System.out.println("Denominators cannot be 0 for a fraction.");
return;
}
  
char operator;
System.out.print("Enter the operation (+, -, *, /): ");
operator = sc.next().charAt(0);
switch(operator)
{
case '+':   resultNumber = add(firstNumber, secondNumber); break;
case '-':   resultNumber = sub(firstNumber, secondNumber); break;
case '*':   resultNumber = mul(firstNumber, secondNumber); break;
case '/':   resultNumber = div(firstNumber, secondNumber); break;
default : return;
}
System.out.print(firstNumber[0]+"/"+firstNumber[1]+operator+secondNumber[0]+"/"+secondNumber[1]+" = "+resultNumber[0]);
if(resultNumber[1] != 1)
System.out.println("/"+resultNumber[1]);
else
System.out.println();
}
}

And the output screenshot is:

% (D < > 1 FractionAsArrays.java 《 Terminal Shell Edit View Window Help [ -))) 100% ES), Wed 16 Nov 00:35 ANANDA KUMAR THUMMAPUDI a Currently Open Docum | * ~/HomeworkLibJava/FractionAsArrays.java ▼ FractionAsAr... GCD.c untitled text 4... HomeworkLibJava.-bash-80x29 public static int [1 div(int[] first, int[ second) 41 42 ▼ 43 /HomeworkLibJavabash int[] result - new int [2] result[0]-first [0] second [1]; result [1] - first[1] second [0] return reduce (result); Macintosh:HomeworkLibJava AnandaKumarThummapudis javac FractionAsArrays.java Macintosh:HomeworkLibJava AnandaKumarThummapudi$ java FractionAsArrays Enter the numerator for the first fraction: 1 Enter the denominator for the first fraction: 2 Enter the numerator for the second fraction:-4 Enter the denominator for the second fraction: 8 Enter the operation +, -, *, /): + 1/2+-4/80 Macintosh:HomeworkLibJava AnandaKumarThummapudi$ java FractionAsArrays Enter the numerator for the first fraction: 7 Enter the denominator for the first fraction: 8 Enter the numerator for the second fraction: 1 45 46 47 48 49 ▼ public static void main(String[] args) Scanner sc = new Scanner(System.in); int] firstNumbernew int[2] int[] secondNumber new int [2]; int[] resultNumber = new int [2]; System. out.print ("Enter the numerator for the first fraction: firstNumber[0] sc.nextInt); System.out.print("Enter the denominator for the first fraction 7/8-1/3 - firstNumber [1] sc.nextInt); 54 Enter the denominator for the second fraction: 3 Enter the operation , -, *, /): 56 13/24 Macintosh:HomeworkLibJava AnandaKumarThummapudis 60 61 62 63 64 65 System. out.print("Enter the numerator for the second fraction: secondNumber [0] - sc.nextInt(); System. out.print("Enter the denominator for the second fractio secondNumber [1] - sc.nextInt(); if (firstNumber [1]0 l secondNumber [1] 0) System.out.println("Denominators cannot be 0 for a fraction. return; 67 u. 68 69 char operator; System.out.print("Enter the operation +, -, *, /): "); operatorsc.next).charAt (0); switch(operator) 71 72 74 75 76 case .+': resultNumber add ( firstNumber, secondNumber); break; case -': resultNumbersub(firstNumber, secondNumber); break; case ·*': resultNumber =mul(firstNumber, secondNumber); break; caseソ': resultNumber=div(firstNumber, secondNumber); break; default return; 78 System.out.print(firstNumber[0]+"/"+firstNumber[1]+operator+secondNumber[0]+"/"+secondNumber[1]+""+resultNumber[0]); if (resultNumber[1] 1) 80 81 82 83 84 85 System.out.println("/"resultNumber[1]); else System.out.println); : 81 C: 28 lava. Unicode (UTF-8)-Unix (LF) ▼ ㎡, Saved: 16/11/16, 12:34:56 AM 2,692/ 315 / 86 100% ▼