RevanInt.java

// Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0.

// Assume the environment does not allow you to store 64-bit integers (signed or unsigned).


 class reverseanint {
    public int reverse(int x) {
        int res = 0;
         while(x != 0){
             int temp = x%10;
             x = x/10;
             if(res > Integer.MAX_VALUE/10 || (res == Integer.MAX_VALUE/10 && temp > 7)) 
                 return 0;
             if(res < Integer.MIN_VALUE/10 || (res == Integer.MIN_VALUE/10 && temp < -8))
                 return 0;
             res = res*10 + temp;
         }
         return res;
                 
     }
   public static void main(String[] args) {
    reverseanint r = new reverseanint();
    System.out.println(r.reverse(123));
   }
}