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#include <iostream>
#include <string>
using namespace std;

int main(){
string bin_n;
int dec_n = 0;
int i;

cout << "請輸入二進位數字：";
cin >> bin_n;
for(i = 0; i < bin_n.length(); i++)
if (bin_n[i] >= 0 && bin_n[i] <= 1)
dec_n = dec_n * 2 + (bin_n[i] - '0');
cout << "轉成十進位為：" << dec_n << endl;

else
cout << "error" <<

return 0;
}