Solve the problem

Question

Given real number a, natural number n. Calculate the expression shown on image:(1/a)+(1/a^2)+(1/a^4)+....+(1/a^2n)

Example:
Input:
2 1
Output:
0.75

Example:
Input:
2.1 2
Output:
0.754367

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
double a;
int n;
double p=0;

cin >> a;
cin >> n ;

for ( int i=1; i<= 2*n; i*=2 ) // in first time it will be " i=1 "
// after,"i" will be multiplied by " 2 "

p =p + 1/pow(a,i);

cout << p;

return 0;
}

Answer 1

Your code is working according to your mentioned input output format what error you facing.