zuoye/zuoye.cpp

#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>

using namespace std;

// <20><><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>
int get_num(char c) {
    if (isdigit(c)) {
        return c - '0';
    }
    if ('a' <= c && c <= 'z') {
        return c - 'a' + 10;
    }
    if ('A' <= c && c <= 'Z') {
        return c - 'A' + 10;
    }
    return 0;
}

// <20><><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>
char get_char(int num) {
    return '0';
}

//<2F><><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݽ<EFBFBD><DDBD><EFBFBD>ת<EFBFBD><D7AA>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>
int to_num(string& number, int base) {
    int n = number.size();
    long long num = 0;
    for (int i = 0; i < n; i++) {
        char ch = number[i];
        num *= base;
        num += get_num(ch);
    }
    return num;
}


//<2F><><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>ݽ<EFBFBD><DDBD><EFBFBD>ת<EFBFBD><D7AA>Ϊ<EFBFBD>ַ<EFBFBD><D6B7><EFBFBD>
string tostring(int num, int base) {
    if (num == 0) return "0";

    string ans;
    while (num > 0) {
        ans += get_char(num % base);
        num /= base;
    }
    reverse(ans.begin(), ans.end());
    return ans;
}

string convertBase(string& num, int st_base, int en_base) {
    return tostring(to_num(num, st_base), en_base);
}

int main() {
    string number;
    int st_base, en_base;

    cout << "<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֣<EFBFBD>";
    cin >> number;
    cout << "<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Դ<EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD>2-16<31><36><EFBFBD><EFBFBD>";
    cin >> st_base;
    cout << "<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD>2-16<31><36><EFBFBD><EFBFBD>";
    cin >> en_base;

    string ans = convertBase(number, st_base, en_base);
    cout << "ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǣ<EFBFBD>" << ans << endl;

    return 0;
}