Program to find sum of series 1 + 1/2 + 1/3 + 1/4 + .. + 1/n

If inverse of a sequence follows rule of an A.P i.e, Arithmetic progression, then it is said to be in Harmonic Progression.In general, the terms in a harmonic progression can be denoted as : 1/a, 1/(a + d), 1/(a + 2d), 1/(a + 3d) .... 1/(a + nd). 
As Nth term of AP is given as ( a + (n – 1)d) .Hence, Nth term of harmonic progression is reciprocal of Nth term of AP, which is : 1/(a + (n – 1)d) 
where "a" is the 1st term of AP and "d" is the common difference.
We can use a for loop to find sum. 
 

Output: 
 

2.283333

Time Complexity: O(n)

Auxiliary Space: O(1), since no extra space has been taken.