// G. Hagopian--Memorize the digits in Pi

#include <iostream>
using namespace std;

const string pi = "3.1415926535897932384626433832795";

int main() {
	string input;
	int counter{ 0 };
	cout << "Enter your approximation for pi: ";
	cin >> input;
	for (int i = 0; i < 34; ++i) {
		if (input[i] == pi[i]) ++counter;
		else break;
	}
	cout << "Congratulations, you guessed " << counter-1 << "correct digits.\n"
		<< "The first you missed was pi[" << counter << "] = " << pi[counter] << endl;
	cout << "\nTry again: ";
	cin >> input;
	int i = 0;
	while (pi[i] == input[i])
		++i;
	cout << "Congratulations, you guessed " << i << "correct digits.\n"
		<< "The first you missed was pi[" << i << "] = " << pi[i] << endl;
}