Java Program to find out GCD of two integer numbers

Here we are explaining how to write a java program to find out the GCD of two numbers.GCD means Greatest Common Divisor.

How do find out the GCD of two number?

GCD of two integer numbers means the greatest positive integer number that can exactly divide both numbers with a remainder zero.

Example: GCD of 50 and 100 is 50.

               GCD of  10 and 50 is 10.

How to implement the java program to find out the GCD of two numbers?

First, we have to declare the class GCD.Then declare the variables num1,num2,temp,GCD.Set GCD=0.Create an object of the scanner class as sc. Read the first number into num1 and the second number into num2.By using a while loop check num2!=0 then calculate temp=num2,num2=num1%num2,num1-temp.Now, num1 has the value of GCD. Then display GCd using system.out.println() method.

ALGORITHM

STEP 1: Declare the class GCD with a public modifier.

STEP 2: Open the main() to start the program, Java program execution starts with the main()

STEP 3: Declare the integer variables num1,num2,temp,GCD.

STEP 4: Set GCD=0.

STEP 5: Create an object of the scanner class as sc.

STEP 6: Read the first number from the user into the variable num1.

STEP 7: Read the second number from the user into the variable num2.

STEP 8: By using a while loop check num2!=0, then do step 9.

STEP 9: Assign temp=num2,num2=num1%num2,num1=temp.

STEP 10: Assign GCD=num1.

STEP 11: Display GCD as GCD.

 

Java Source Code

                                          import java.util.Scanner;
public class GCD {
 public static void main(String[] args) {
  int num1,
  num2,
  temp,
  GCD = 0;
  Scanner sc = new Scanner(System. in );

  System.out.println("Enter the first Number: ");
  num1 = sc.nextInt();
  System.out.println("Enter the second Number: ");
  num2 = sc.nextInt();
  while (num2 != 0) {
   temp = num2;
   num2 = num1 % num2;
   num1 = temp;
  }
  GCD = num1;
  System.out.println("\n GCD =  " + GCD);
 }
}
                                      

OUTPUT

Enter the first Number: 100
Enter the second Number: 50

 GCD =  50