华为编程题十六进制转十进制

#include<iostream>
#include <string>
#include <cmath>
using namespace std;
int main()
{
	string s;
	int temp = 0;
	int Dec = 0;
	while (getline(cin,s))
	{
		int len = s.length();
		for (int i = 2; i < len;i++)
		{
			if (s[i] >= '0'&&s[i] <= '9')
			{
				Dec += ((s[i]-48)*pow(16, (len - 1 - i)));
			}
			if (toupper(s[i]) >= 'A'&&toupper(s[i]) <= 'Z')

			{
				Dec += (toupper(s[i]-55)*pow(16, (len - 1 - i)));
			}
		}
		cout << Dec << endl;
		Dec = 0;
	}
	system("pause");
	return 0;
}