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7ReverseInteger.cs
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7ReverseInteger.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _7ReverseInteger
{
class Program
{
static void Main(string[] args)
{
}
/*
* http://www.cnblogs.com/TenosDoIt/p/3735866.html
*
*
*/
/*
*
http://yucoding.blogspot.ca/2013/04/leetcode-question-84-reverse-integer.html
*
*/
public static int reverse(int x)
{
int res = 0;
while (x != 0)
{
if (res > Int32.MaxValue / 10 || res < Int32.MinValue / 10)
{
return 0;
}
res = res * 10 + x % 10; // x = 12, so s % 10 = 2,
x = x / 10;
}
return res;
}
/*
* http://www.cnblogs.com/TenosDoIt/p/3735866.html
*/
int reverse2(int x) {
bool isPositive = true;
if(x < 0){
isPositive = false;
x *= -1;
}
long res = 0;//为了防止溢出,用long long
while(x > 0)
{
res = res*10 + x%10;
x /= 10;
}
if(res > Int32.MaxValue)
return isPositive ? Int32.MaxValue : Int32.MinValue;
if(!isPositive)
return (int) res * (-1);
else return (int)res;
}
}
}