Thread: What does this code do?

Here is a code to check if a number is prime or not

public class PrimeExample{    
 public static void main(String args[]){    
  int i,m=0,flag=0;      
  int n=3;//it is the number to be checked    
  m=n/2;      
  if(n==0||n==1){  
   System.out.println(n+" is not prime number");      
  }else{  
   for(i=2;i<=m;i++){      
    if(n%i==0){      
     System.out.println(n+" is not prime number");      
     flag=1;      
     break;      
    }      
   }      
   if(flag==0)  { System.out.println(n+" is prime number"); }  
  }//end of else  
}    
}

I wonder what are the variables m and flag meant for?

P.S:I just found this program on the internet, i didn't write it.

what are the variables m and flag meant for?

Read the code to see what values those variables hold.
What is in m?
What is in flag?
In what conditions are they given values?