leetcode - Reverse Integer
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Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
分析:先记录正负,再逐位反转
class Solution {public: int reverse(int x) { bool negative = false; int ret = 0; if(x < 0) { x = 0-x; negative = true; } while(x) { ret *= 10; ret += x%10; x = x/10; } if(negative) ret = 0 - ret; return ret; }};
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