两相异正数的等差中项和等比中项

#include <iostream>#include <cmath>#include <iomanip>#include <vector>using namespace std;

//求数列an的第n项

double ArithmeticalMean(double a, double b, int n){vector<double> temp1(n + 1);vector<double> temp2(n + 1);temp1[0] = a;temp2[0] = b;for (int i = 1; i <= n; ++i){temp1[i] = (temp1[i - 1] + temp2[i - 1]) / 2;temp2[i] = sqrt(temp1[i - 1] * temp2[i - 1]);}return temp1[n];}int main(){cout << setprecision(16) << ArithmeticalMean(200000, 1, 5) << endl;cout << ArithmeticalMean(200000, 1, 100) << endl;}