如何扭转一个数为整数，而不是作为一个字符串？ [英] How to reverse a number as an integer and not as a string?

问题描述

我遇到了一个问题：怎样才能扭转数为整数，而不是作为一个字符串？任何人都可以请帮我找出答案。

I came across a question "How can one reverse a number as an integer and not as a string?" Could anyone please help me to find out the answer.

推荐答案

这应该做到这一点：

int n = 12345;
int left = n;
int rev = 0;
while(left>0)
{
   r = left % 10;   
   rev = rev * 10 + r;
   left = left / 10;  //left = Math.floor(left / 10); 
}

Console.WriteLine(rev);

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