Add two fractions using Java

March 21, 2023

Add two fractions using java 

In this article we will discuss the program for add two fractions using java. For this purpose we need to ask the user to enter two fractional values where each fraction must consist a Numerator and a Denominator.

add two fractions using java

Concept

 For understanding this in a better way lets suppose an example :

 Suppose, First fraction consist of 1 as numerator and 3 as denominator, and Second fraction consist of 3 as numerator and 9 as denominator.

 (1 / 3) + (3 / 9) = (6 / 9) = (2 / 3)

  • Find LCM of 3 and 9 and the result will be 9.
  • Multiply 3 in first fraction : (3 / 9) + (3 / 9)
  • Add both fractions and then the result will be : (6 / 9)
  • Now simplify it by finding the HCF of 6 and 9 and the result will be 3.
  • So divide 6 and 9 by 3 and then the result will be : (2 / 3)
  • This will be your simplified answer for the given problem.

Algorithm

  • Initialize variables of numerator and denominator
  • Take user input of two fraction
  • Find numerator using this condition (n1*d2) +(d1*n2 ) where n1,n2 are numerator and d1 and d2 are denominator
  • Find denominator using this condition (d1*d2) for lcm
  • Calculate GCD of a this new numerator and denominator
  • Display a two value of this condition x / gcd, y/gcd
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Java code

Run 
//Java program to add two fractions
import java.util.Scanner;
public class Main
{
	public static void main(String[] args)
	{
		//scanner class declaration
		Scanner sc = new Scanner(System.in);
		//input from the user		
		System.out.print("Enter numerator for first fraction : ");		
		int num1 = sc.nextInt();
		System.out.print("Enter denominator for first fraction : ");		
		int den1 = sc.nextInt();
		System.out.print("Enter numerator for second fraction : ");		
		int num2 = sc.nextInt();
		System.out.print("Enter denominator for second fraction : ");		
		int den2 = sc.nextInt();
		int num, den, x;
		System.out.print("("+num1+" / "+den1+") + ("+num2+" / "+den2+") = ");
		//logic for calculating sum of two fractions
		if(den1 == den2)
		{
			num = num1 + num2 ;
			den = den1 ;
		}
		else{
			num = (num1*den2) + (num2*den1);
			den = den1 * den2;
		}
		if(num > den)
			x = num;
		else
			x = den;
		for(int i = 1 ; i <= x ; i++)
		{
			if(num%i == 0 && den%i == 0)
			{
				num = num/i;
				den = den/i;
			}
		}
		//logic for getting simplified fraction
		int n = 1;
		int p = num;
		int q = den;
		if( num != den)
		{
			while(n != 0)
			{
				//storing remainder
				n = num % den;			
				if(n != 0)
				{
					num = den;
					den = n;
				}
			}			
		}
		System.out.println("("+p/den+" / "+q/den+")");
		//closing scanner class(not compulsory, but good practice)
		sc.close();									
	}
}

Output

Enter numerator for first fraction : 1
Enter denominator for first fraction : 3
Enter numerator for second fraction : 3
Enter denominator for second fraction : 9
(1 / 3) + (3 / 9) = (2 / 3)

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3 comments on “Add two fractions using Java”


  • Tridip

    public class Frac{

    public static void main(String[] args){

    int num1 = 4;

    int deno1 = 5;

    int num2 = 6;

    int deno2 = 7;

    int numerator = (num1 * deno2) + (num2 * deno1);
    int denomerator = deno1 * deno2;

    int resultN = numerator /gcd(numerator , denomerator);
    int resultD = denomerator /gcd(numerator , denomerator);

    System.out.println(resultN +”/” +resultD);

    }

    public static int gcd(int a , int b){

    return b==0?a:gcd(b , a%b);

    }

    }


  • deepanshusaxena1803

    import java.util.*;
    public class Main{
    public static int lcm(int a,int b){
    int l=a>b?a:b;
    int la=0;
    for(int i=l;i<=(a*b);i++){
    if(i%a==0&&i%b==0){
    la=i;
    break;
    }
    }
    return la;
    }
    public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    int n1,n2,d1,d2,n=0,d=0;
    n1=sc.nextInt();
    n2=sc.nextInt();
    d1=sc.nextInt();
    d2=sc.nextInt();
    System.out.print("("+n1+"/"+d1+")+("+n2+"/"+d2+")=");
    if(d1==0 || d2==0){
    System.out.println("Invalid Fraction");
    }
    else{
    d=lcm(d1,d2);
    n1=n1*(d/d1);
    n2=n2*(d/d2);
    n=n1+n2;
    System.out.println("("+n+"/"+d+")");
    }
    }
    }


  • Asif

    import java.util.*;
    public class Main
    {
    public static void main(String[] args) {
    int a, b,c,d,x,y,i,gcd = 0;
    Scanner sc = new Scanner(System.in);
    System.out.println(“\nEnter the numerator for 1st number : “);
    a = sc.nextInt();
    System.out.println(“\nEnter the denominator for 1st number : “);
    b = sc.nextInt();
    System.out.println(“\nEnter the numerator for 2nd number : “);
    c = sc.nextInt();
    System.out.println(“\nEnter the denominator for 2nd number : “);
    d = sc.nextInt();
    x=(a*d)+(b*c); //numerator
    y=b*d; //denominator
    // Trick part. Reduce it to the simplest form by using gcd.
    for(i=1; i <= x && i <= y; ++i)
    {
    if(x%i==0 && y%i==0)
    gcd = i;
    }
    System.out.println(“\nThe added fraction is “+ x/gcd + “/” + y/gcd);
    System.out.println();
    }
    }