十六进制转十进制(普通版)

#include<iostream>
#include<string>
#include<sstream>


using namespace std;


int value(int bite);
string getTemp(string data); 
long long getValue(string data);


int main(int argc,char** argv){

string data = "";
cin >> data;
cout << getValue(getTemp(data));

return 0;
}


int value(int bite){

bite--;
int resault = 1;

while(bite){

resault = resault * 16;
bite--;
}

return resault;
}


string getTemp(string data){

int length = data.length();
string resault = "";

for(int i = 0;i < 8 - length;i++){

resault = resault + "0";
}

for(int i = 8 - length;i < 8;i++){

resault = resault + data[i + length - 8];
}

return resault;
}


long long getValue(string data){

long long resault = 0;

for(int i = 0;i < 8;i++){

char temp = data[i];
long long value_temp = 0;

switch(temp){

case '0':
value_temp = 0;
break;

case '1':
value_temp = 1;
break;

case '2':
value_temp = 2;
break;

case '3':
value_temp = 3;
break;

case '4':
value_temp = 4;
break;

case '5':
value_temp = 5;
break;

case '6':
value_temp = 6;
break;

case '7':
value_temp = 7;
break;

case '8':
value_temp = 8;
break;

case '9':
value_temp = 9;
break;

case 'A':
value_temp = 10;
break;

case 'B':
value_temp = 11;
break;

case 'C':
value_temp = 12;
break;

case 'D':
value_temp = 13;
break;

case 'E':
value_temp = 14;
break;

case 'F':
value_temp = 15;
break;

default:
value_temp = 0;
break;
}

resault = resault + value_temp * value(8 - i);
}

return resault;
}