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Write A program to check Number is Power of two or not

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import java.io.*;

public class PowerOfTwo
{
public static void main(String a[]) throws IOException
{
System.out.println("Welcome to the PowerOfTwo project!");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int num = Integer.parseInt(br.readLine());
int flag=1;
if(num==0){
   System.out.println("Not a power of two");
   System.exit(0);
 
}

while(num!=1){
   if(num%2!=0){
       flag=0;
       break;
   }
 num=num/2;
}
if(flag==0){
   System.out.println("Not a power of two");
}
else
   System.out.println("Power of Two");
}
}

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