题解 | #进制转换#

C++

#include<iostream>
#include<string>
#include<math.h>
using namespace std;
int main()
{
    string str;
    while(cin>>str)
    {
        int res = 0;
        int len = str.size();
        for(int i = 2;i<len;++i)
        {
            if(str[i]>='A' && str[i]<='F') 
            {
                int num = str[i]-'A' ;
                num+=10;
                res = res + pow(16,len - i-1) * num;
            }
            else if(str[i]>='0' && str[i]<='09')
            {
                int num = str[i]-'0' ;
                res = res + pow(16,len - i-1) * num;
            }
        }
        cout<<res<<endl;;
    }

    return 0;
}