蓝桥杯＿基础练习 十六进制转十进制

#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;
}