Question

How to caculate the harmonic series Hn = 1 + 1/2 + 1/3 + 1/4 + 1/n in C++

Answer 1

#include <iostream>

double harmonic(int n) {
    double sum = 0.0;

    for (int i = 1; i <= n; i++) {
        sum += 1.0 / i;   // add 1/i as double
    }

    return sum;
}

int main() {
    int n = 5;  
    
    std::cout << "H_" << n << " = " << harmonic(n) << std::endl;
}


/*
run:

H_5 = 2.28333

*/

 

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