题解 | #进制转换#

#include <iostream>
#include <string>
#include <math.h>
using namespace std;

int main()
{
    string sTmp;
    while(cin >> sTmp)
    {
        int length = sTmp.size();
        if(sTmp[0] != '0' || sTmp[1] != 'x')
        {
            break;
        }
        //int n = 0;
        int result = 0;
        for(int i = length-1; i>1; i--)
        {
            if(sTmp[i] >= '0' && sTmp[i] <= '9')
            {
                result += (sTmp[i] - '0')*pow(16, length-1-i);
            }
            else if(sTmp[i] >= 'A' && sTmp[i] <= 'F')
            {
                result += (sTmp[i] - 'A' + 10)*pow(16, length-1-i);
            }
        }
        cout << result <<endl;
    }

    return 0;
}