Question

How to find the harmonic value of N (1 + 1/2 + 1/3 + ... 1/N) in PHP

Answer 1

// harmonic value of N  = (1 + 1/2 + 1/3 + ... 1/N)

function get_harmonic_value($n) {
    $hv = 0.0;

    for ($i = 1; $i <= $n; $i++) {
        $hv += 1 / $i;
    }

    return $hv;
}

$n = 6;

echo "Harmonic value: " . get_harmonic_value($n);



/*
run:
   
Harmonic value: 2.45
   
*/

 

70+ SQL courses for beginners and professionals

Answer 2

// harmonic value of N  = (1 + 1/2 + 1/3 + ... 1/N)

function get_harmonic_value($n) {
    if ($n == 1) { 
        return 1.0; 
    } else { 
        return 1.0 / $n + get_harmonic_value($n - 1); 
    }
}

$n = 6;

echo "Harmonic value: " . get_harmonic_value($n);



/*
run:
   
Harmonic value: 2.45
   
*/

 

70+ SQL courses for beginners and professionals