min = 0;
max =arr.length -1;
mid =(min + max) /2;
while( value != arr[mid]){
   if(value > arr[mid]){
      min = mid+1;
    }else if(value < arr[mid]){
      max = mid-1;   
   }

   if(min > max) return -1;
   mid = (min + max)/2;
}
return mid;

min = 0;
max =arr.length -1;
mid =(min + max) /2;
while( value != arr[mid]){
   if(value > arr[mid]){
      min = mid+1;
    }else if(value < arr[mid]){
      max = mid-1;   
   }

   if(min > max) return -1;
   mid = (min + max)/2;
}
return mid;