题目原文:
Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
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分析:将整数倒序,符号不变,需要注意的是当改变后的值超出整数的可表示范围后,返回0.
代码:
//Reverse digits of an integer.
//
//Example1: x = 123, return 321
//Example2: x = -123, return -321
#include <iostream>
using namespace std;
class Solution {
public:
int reverse(int x) {
int nFlag = 1;
int nRet = 0;
int nLeft =0;
int nOld = 0;
if (x < 0)
{
x *= -1;
nFlag = -1;
}
while (x != 0)
{
nLeft = x % 10;
x = x/10;
nOld = nRet;
nRet = nRet *10 + nLeft;
}
if (nOld != nRet / 10)
{
return 0;
}
nRet *= nFlag;
return nRet;
}
};