trying to find range of long data type in java

trying to verify range of long in java.. why is this program not working? it gives infinite loop (probably). i'm not getting output at the command line and the cursor keeps blinking.

class range
{
public static void main(String [] args)
{
         long i;
     for(i=0;;i++)
    {
         long c= (long)(i+1);
         if(i>c)    //upper_limit+1=lower_limit
            break;  // hence, at i=upper_limit c(=i+1) < i

    }
    System.out.println("upper ="+i);
    for(i=-1;;i--)
    {
        long c=(long)(i-1);         
        if(i<c)             //lowerlimit-1=upperlimit
            break;          //hence at i=lowerlimit c(=i-1)>i
    }
    System.out.println("lower ="+i);
}
}