Program of finding out the Greatest Common Division (GCD) or the Highest Common Factor (HCF) of the given two numbers

class GCD
{
public static void main(String args[])
{
int num_1 , num_2 ; 
num_1 = 25;
num_2 = 15;

System.out.print("The GCD of "+num_1+" and "+num_2);


while ((num_1!=0) && (num_2!=0)) 
{
if (num_1 > num_2)
num_1 = num_1 - num_2 ;
else
num_2 = num_2 - num_1 ;
}


System.out.print(" is "+num_1);
}
}