#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
long hex2int(const string& hexStr);
int main( ) {
string str1 = "0x12AB";
cout << hex2int(str1) << endl;
string str2 = "12AB";
cout << hex2int(str2) << endl;
}
long hex2int(const string& hexStr) {
char *offset;
if (hexStr.length( ) > 2) {
if (hexStr[0] == '0' && hexStr[1] == 'x') {
return strtol(hexStr.c_str( ), &offset, 0);
}else{
cout << "hex must start with 0x";
return 0;
}
}
}
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