Reverse Integer, leetcodereverse

Reverse Integer, leetcodereverse

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x =-123, return-321

Note:
The input is assumed to be a 32-bit signed integer. Your function shocould return 0 when the reversed integer overflows.

Returns the integer of a number.

Example 1: x = 123, 321 is returned
Example 2: x =-123, returns-321

Note:

Assume that the input is a 32-bit signed integer. When the inverted integer overflows, your function should return 0.

My personal biggest disadvantage of LeetCode is that I can do it as soon as I come up. because English is easy to read without Chinese, many prompts are not noticed at all. If this question overflows, 0 is returned.

 

class Solution {    public int reverse(int x) {      boolean isAbove=true;        StringBuffer sBuffer=new StringBuffer();        int newX=x;        if (x < 0) {            isAbove = false;            x = Math.abs(x);        }        while (x > 0) {            sBuffer.append(x % 10);            x = x / 10;        }        if (newX!=0) {            try {                if (isAbove)                    return Integer.parseInt(sBuffer.toString());                else                    return -Integer.parseInt(sBuffer.toString());            } catch (Exception e) {                return 0;            }                    }        else             return 0;    }}

 

Next, let's review the value range of the Basic JAVA data types:

The value range of byte is-128 ~ 127, occupies 1 byte (to the power of-2 to the power of 2 to the power of-1)
The short value range is-32768 ~ 32767, occupies 2 bytes (the 15th power of-2 to the 15th power of 2-1)
The value range of int Is (-2147483648 ~ 2147483647), occupies 4 bytes (the 31 Power of-2 to the 31 power of 2-1)
The value range of long is (-9223372036854774808 ~ 9223372036854774807), occupies 8 bytes (63 power of-2 to 63 power of 2-1)