Reverse Integer
Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
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SOLUTION 1:
注意越界后返回0.先用long来计算,然后,把越界的处理掉。
public class Solution {
public int reverse(int x) {
long ret = 0; while (x != 0) {
ret = ret * 10 + x % 10;
x /= 10;
} if (ret > Integer.MAX_VALUE || ret < Integer.MIN_VALUE) {
return 0;
} return (int)ret;
}
}
GITHUB:
https://github.com/yuzhangcmu/LeetCode_algorithm/blob/master/math/Reverse.java