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Tuesday, 23 April 2013

Java code to find HCF & LCM of two numbers using recursion

Java program to find the HCF(Highest Common Factor) & LCM(Least Common Multiple) of two numbers using recursion.

class Hcf_Lcm
 int n1,n2,hcf,lcm;
 public static void main(String args[]) throws IOException
 Hcf_Lcm call = new Hcf_Lcm();
 public void readData() throws IOException
 BufferedReader br = new BufferedReader(new InputStreamReader(;
 System.out.print("Enter 1st number : ");
 n1 = Integer.parseInt(br.readLine());
 System.out.print("Enter 2nd number : ");
 n2 = Integer.parseInt(br.readLine());
 public int findHCF(int a, int b)
  return b;
  return findHCF(b%a,a);
 public int findLCM(int a, int b, int hcf)
 return (a*b)/hcf;
 public void display()
 hcf = findHCF(n1,n2);
 lcm = findLCM(n1,n2,hcf);
 System.out.println("\nHCF = " +hcf);
 System.out.println("LCM = " +lcm);


1. Start

2. Accept two numbers from user.

3. Using method of recursion, find the HCF.

4. Find the LCM by multiplying the numbers and dividing by their HCF.

5. Print HCF and LCM.

6. End


Java code to find HCF & LCM of two numbers using recursion

Enter 1st number : 8

Enter 2nd number : 36

HCF = 4

LCM = 72

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