具有前导零的数字的反向 [英] Reverse of a number with leading zeroes

问题描述

我们如何逆转数字中前导零的数字？
例如：如果输入是004，
输出应该是400.

How do we reverse a number with leading zeroes in number ? For ex: If input is 004, output should be 400.

我在下面写程序，但它只有当输入没有前导零。

I wrote below program but it works only when no leading zeroes in input.

int num;
cout<<"Enter number "<<endl;
cin>>num;

int rev = 0;
int reminder;
while(num != 0)
{
    reminder = num % 10;
    rev = rev * 10 + reminder;
    num = num / 10;
}
cout<<"Reverse = "<<rev<<endl;

有没有办法输入带有前导零的数字？即使这样，上述逻辑对这样的数字不起作用。

Is there any way to input a number with leading zeroes ? Even then, Above logic doesn't work for such numbers.

任何简单的解决方案？它可以通过将输入作为字符串并处理它。但这看起来不太好。

Any simple solution ? It is doable by taking input as string and processing it. But that doesn't look nice.

* 编辑：如果数字的长度已知，非零。（不使用字符串）

* If length of number is known, it looks to be possible to reverse a number with leading zeroes. (Without using string)*

我会在代码生效后立即发布。

I shall post the code as soon as it works.

编辑2：我试图把字符放回到cin流，然后读取并计算相反。它适用于2位数字。

EDIT 2: I tried to put back characters to cin stream and then read and calculate the reverse. It is working for 2 digit numbers.

但如果长度已知，它更容易找到相反。我需要做的是，乘以10所需的次数。
所以我想，我会去与字符串的方法。
希望面试官快乐：）

But if length is known, its far easier to find reverse. All i need to do is, multiply by 10 for required number of times. So i think, i would go with string approach. Hoping that interviewer would be happy :)

推荐答案

前导零不是由二进制数字表示c> int ， double 等）所以你可能需要使用 std :: string 。读取字符串中的输入，然后调用 std :: reverse（）将该字符串作为输入。

Leading zeroes are not represented by binary numbers (int, double, etc.) So you'll probably have to use std::string. Read the input into the string, then call std::reverse() passing the string as input.

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