求逆序数

输入一个整数，如83721，输出其逆序数12738

#include <iostream>

using namespace std;

int reverseNumber ( int input )

{

    int retval = 0;

    while ( input )

    {

        int lowNumber = input % 10 ;

        retval = retval * 10 + lowNumber;

        input = (input - lowNumber)/10;

    }

    return retval;

}

int main()

{

    cout << "Hello World!" << endl;

    cout << reverseNumber(83721)<<endl;

    return 0;

}