蓝桥杯＿基础练习 十六进制转十进制

问题描述

　　从键盘输入一个不超过8位的正的十六进制数字符串，将它转换为正的十进制数后输出。
　　注：十六进制数中的10~15分别用大写的英文字母A、B、C、D、E、F表示。

样例输入

FFFF

样例输出

65535

#include<memory>#include<iostream>#include<string>#include<cctype>#include<algorithm>#include<cmath>#include<ctime>#include<cstdlib>#include<cstdio>#include<sstream>using namespace std;bool to16_10(std::string& word ){    long long count = 0;    for (unsigned int var1 = 0; var1 < word.length (); ++var1) {        if(word.at(var1) >= '0' && word.at (var1) <= '9'){            count  = 16*count + (word.at (var1) - '0');        }        else if(word.at(var1) >= 'A' && word.at (var1) <= 'F'){            count  = 16*count + (word.at (var1) - 'A'+10);        }    }    std::stringstream ss;    ss << count;    ss >> word;    return true;}int main(int argc, char *argv[]){    string word;    cin >> word;    to16_10 (word);    cout <<word <<endl;    return 0;}