C55-谁是小学霸-7

八进制转十进制

#include<iostream>
#include<cmath>
using namespace std;
int main() {
	string s;
	cin >> s;	//"132"
	int len = s.size();
	int k = 0, dec = 0;
	for (int i=len-1; i>=0; i--) {
//		cout << s[i] << endl;
		dec += (s[i] - 48)*pow(8, k++);
	}
	cout << dec;

	return 0;
}