HJ05 HJ5 进制转换

​​HJ5 进制转换​​

#include <iostream>

class HJ05 {
public:
    static int hex2int(std::string hex) {
        int i = 0;
        if (hex[i] == '0') {
            i += 1;
        }
        if (hex[i] == 'x' || hex[i] == 'X') {
            i += 1;
        }
        int ans = 0;
        for (; i < hex.size(); i++) {
            int d = 0;
            if ('0' <= hex[i] && hex[i] <= '9') {
                d = hex[i] - '0';
            } else if ('a' <= hex[i] && hex[i] < 'f') {
                d = hex[i] - 'a' + 10;
            } else if ('A' <= hex[i] && hex[i] <= 'F') {
                d = hex[i] - 'A' + 10;
            }
            ans = ans * 16 + d;
        }
        return ans;
    }
};


size_t mystrcpy(char* s, const char* cs) {
    const char* p = cs;
    while (*p) {
        *s++ = *p++;
    }
    *s = '\0';
    return p - cs;
}

int main(int argc, char *argv[]) {
    HJ05 q;
    // char s[BUFSIZ] = {'\0'};
    // std::cin.get(s, BUFSIZ).get();
    std::string s;
    std::cin >> s;
    // mystrcpy(s, "0xAA");

    std::cout << HJ05::hex2int(s);
    return 0;
}